| Summary of Segment Information | 
 Segment results from operations for the years ended December 31, 2021, 2020 and 2019 were as follows: 
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| Year Ended December 31, 2021 | 
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Expedited Freight | 
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Intermodal | 
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Corporate | 
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Eliminations | 
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Consolidated - Continuing Operations | 
 
| External revenues | 
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 | 
 | 
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$ | 
1,373,313  | 
 | 
 | 
$ | 
289,171  | 
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$ | 
—  | 
 | 
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$ | 
—  | 
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$ | 
1,662,484  | 
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| Intersegment revenues | 
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 | 
 | 
957  | 
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43  | 
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 | 
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—  | 
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(1,057) | 
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 | 
(57) | 
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| Depreciation | 
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21,623  | 
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 | 
3,538  | 
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63  | 
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—  | 
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25,224  | 
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| Amortization | 
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7,219  | 
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 | 
7,109  | 
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—  | 
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—  | 
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14,328  | 
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| Income (loss) from continuing operations | 
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139,321  | 
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30,117  | 
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(10,137) | 
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—  | 
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 | 
159,301  | 
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| Purchases of property and equipment  | 
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36,364  | 
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2,745  | 
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—  | 
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—  | 
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39,109  | 
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| Year Ended December 31, 2020 | 
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Expedited Freight | 
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Intermodal | 
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Corporate | 
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Eliminations | 
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Consolidated - Continuing Operations | 
 
| External revenues | 
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 | 
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$ | 
1,070,106  | 
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 | 
$ | 
199,567  | 
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$ | 
—  | 
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$ | 
—  | 
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$ | 
1,269,673  | 
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| Intersegment revenues | 
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2,195  | 
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36  | 
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—  | 
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(2,331) | 
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(100) | 
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| Depreciation | 
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19,824  | 
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 | 
3,693  | 
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120  | 
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—  | 
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23,637  | 
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| Amortization | 
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7,203  | 
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6,285  | 
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—  | 
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—  | 
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13,488  | 
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| Income (loss) from continuing operations | 
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71,266  | 
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16,391  | 
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(13,733) | 
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—  | 
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73,924  | 
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| Purchases of property and equipment | 
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19,820  | 
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448  | 
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—  | 
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—  | 
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20,268  | 
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| Year Ended December 31, 2019 | 
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Expedited Freight | 
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Intermodal | 
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Corporate | 
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Eliminations | 
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Consolidated - Continuing Operations | 
 
| External revenues | 
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$ | 
997,877  | 
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$ | 
217,606  | 
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$ | 
—  | 
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$ | 
—  | 
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$ | 
1,215,483  | 
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| Intersegment revenues | 
 | 
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3,057  | 
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 | 
105  | 
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—  | 
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(3,458) | 
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(296) | 
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| Depreciation | 
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 | 
23,087  | 
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 | 
3,086  | 
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 | 
38  | 
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—  | 
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26,211  | 
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| Amortization | 
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 | 
4,335  | 
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5,848  | 
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—  | 
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—  | 
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 | 
10,183  | 
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| Income (loss) from continuing operations | 
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103,640  | 
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23,679  | 
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(14,903) | 
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—  | 
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112,416  | 
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| Purchases of property and equipment | 
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21,290  | 
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717  | 
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—  | 
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—  | 
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22,007  | 
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| Total Assets | 
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| As of December 31, 2021 | 
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$ | 
777,987  | 
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$ | 
249,467  | 
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$ | 
90,588  | 
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$ | 
(219) | 
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$ | 
1,117,823  | 
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| As of December 31, 2020 | 
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706,396  | 
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183,073  | 
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84,370  | 
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(545) | 
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973,294  | 
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A reconciliation from the segment information to the consolidated balances for revenues and total assets is set forth below: 
  
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Year Ended | 
 
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December 31, 2021 | 
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December 31, 2020 | 
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December 31, 2019 | 
 
| Intersegment revenues - continuing operations | 
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$ | 
(57) | 
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 | 
$ | 
(100) | 
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$ | 
(296) | 
 | 
 
| Intersegment revenues - discontinued operation | 
 | 
57  | 
 | 
 | 
100  | 
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 | 
296  | 
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| Consolidated intersegment revenues | 
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$ | 
—  | 
 | 
 | 
$ | 
—  | 
 | 
 | 
$ | 
—  | 
 | 
 
  
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December 31, 2021 | 
 | 
December 31, 2020 | 
 
| Segment assets - continuing operations | 
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$ | 
1,117,823  | 
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$ | 
973,294  | 
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| Current assets held for sale | 
 | 
—  | 
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 | 
21,002  | 
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| Noncurrent assets held for sale | 
 | 
—  | 
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 | 
53,097  | 
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| Consolidated total assets | 
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$ | 
1,117,823  | 
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$ | 
1,047,393  | 
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Revenue from the individual services within the Expedited Freight segment for the years ended December 31, 2021, 2020 and 2019 were as follows: 
  
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|   | 
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Year Ended | 
 
|   | 
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December 31, 2021 | 
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December 31, 2020 | 
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December 31, 2019 | 
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| Expedited Freight revenues: | 
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  | 
 | 
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  | 
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| Network | 
 | 
$ | 
840,429  | 
 | 
 | 
$ | 
625,517  | 
 | 
 | 
$ | 
675,312  | 
 | 
 | 
 | 
 
| Truckload | 
 | 
223,026  | 
 | 
 | 
194,058  | 
 | 
 | 
196,855  | 
 | 
 | 
 | 
 
| Final Mile | 
 | 
275,201  | 
 | 
 | 
224,475  | 
 | 
 | 
100,555  | 
 | 
 | 
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| Other | 
 | 
35,614  | 
 | 
 | 
28,251  | 
 | 
 | 
28,212  | 
 | 
 | 
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| Total  | 
 | 
$ | 
1,374,270  | 
 | 
 | 
$ | 
1,072,301  | 
 | 
 | 
$ | 
1,000,934  | 
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 | 
 
  
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