Quarterly report pursuant to Section 13 or 15(d)

Segment Reporting (Details)

v3.19.2
Segment Reporting (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Segment Reporting Information [Line Items]          
External revenues $ 345,756 $ 330,343 $ 667,227 $ 632,951  
Depreciation 8,013 8,166 16,329 16,546  
Amortization 2,668 2,196 5,179 4,506  
Share-based compensation expense 3,197 2,417 6,244 4,678  
Interest expense 581 483 1,156 854  
Operating Income (Loss) 30,550 32,870 55,284 57,105  
Total assets 936,557 711,292 936,557 711,292 $ 760,215
Capital expenditures 12,508 11,385 $ 16,598 17,606  
Number of reportable segments     4    
Expedited LTL [Member]          
Segment Reporting Information [Line Items]          
External revenues 203,989 191,159 $ 381,343 359,521  
Intersegment revenues 1,733 1,732 2,932 3,314  
Depreciation 4,848 4,732 9,817 9,355  
Amortization 1,060 825 1,884 1,730  
Share-based compensation expense 2,272 1,877 4,294 3,553  
Interest expense       1  
Operating Income (Loss) 26,889 26,526 46,436 47,298  
Total assets 608,716 466,329 608,716 466,329  
Capital expenditures 11,589 10,648 13,670 16,705  
Intermodal [Member]          
Segment Reporting Information [Line Items]          
External revenues 50,522 49,084 104,619 97,562  
Intersegment revenues 17 78 35 169  
Depreciation 463 444 932 953  
Amortization 1,330 1,093 2,737 2,185  
Share-based compensation expense 443 210 974 500  
Interest expense   24 2 37  
Operating Income (Loss) 5,245 5,543 11,426 9,012  
Total assets 187,815 151,962 187,815 151,962  
Capital expenditures 142 125 215 207  
Truckload Expedited [Member]          
Segment Reporting Information [Line Items]          
External revenues 45,543 46,903 90,467 90,064  
Intersegment revenues 570 2,044 1,313 4,976  
Depreciation 1,478 1,541 3,043 3,244  
Amortization 21 21 43 76  
Share-based compensation expense 118 166 266 345  
Interest expense 2 2 4 3  
Operating Income (Loss) 689 1,717 1,530 1,674  
Total assets 74,822 69,082 74,822 69,082  
Capital expenditures 172 36 328 40  
Pool Distribution [Member]          
Segment Reporting Information [Line Items]          
External revenues 45,702 43,197 90,798 85,804  
Intersegment revenues 103 108 192 172  
Depreciation 1,224 1,448 2,538 2,994  
Amortization 257 257 515 515  
Share-based compensation expense 153 113 334 229  
Operating Income (Loss) 1,567 1,589 2,818 2,960  
Total assets 103,720 58,695 103,720 58,695  
Capital expenditures 605 576 2,385 654  
Elimination [Member]          
Segment Reporting Information [Line Items]          
Intersegment revenues (2,423) (3,962) (4,472) (8,631)  
Depreciation   1 (1)    
Share-based compensation expense 211 51 376 51  
Interest expense 579 457 1,150 813  
Operating Income (Loss) (3,840) (2,505) (6,926) (3,839)  
Total assets $ (38,516) $ (34,776) $ (38,516) $ (34,776)