Quarterly report pursuant to Section 13 or 15(d)

Segment Reporting (Details)

v3.8.0.1
Segment Reporting (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Segment Reporting Information [Line Items]      
External revenues $ 302,608 $ 262,046  
Depreciation and amortization 10,690 10,033  
Share-based compensation expense 2,261 1,962  
Interest expense 371 282  
Operating Income (Loss) 24,235 23,743  
Total assets 690,207 639,484 $ 692,622
Capital expenditures $ 6,221 2,652  
Number of reportable segments 4    
Expedited LTL [Member]      
Segment Reporting Information [Line Items]      
External revenues $ 168,363 148,179  
Intersegment revenues 1,581 586  
Depreciation and amortization 5,528 5,563  
Share-based compensation expense 1,675 1,645  
Interest expense 0 1  
Operating Income (Loss) 20,773 18,928  
Total assets 634,599 634,039  
Capital expenditures 6,058 2,511  
Truckload Expedited [Member]      
Segment Reporting Information [Line Items]      
External revenues 43,161 46,240  
Intersegment revenues 2,933 848  
Depreciation and amortization 1,757 1,558  
Share-based compensation expense 180 95  
Interest expense 1    
Operating Income (Loss) (43) 1,755  
Total assets 65,263 55,523  
Capital expenditures 4 6  
Pool Distribution [Member]      
Segment Reporting Information [Line Items]      
External revenues 42,607 38,731  
Intersegment revenues 64 70  
Depreciation and amortization 1,804 1,802  
Share-based compensation expense 116 88  
Operating Income (Loss) 1,371 1,367  
Total assets 57,324 50,120  
Capital expenditures 78 83  
Intermodal [Member]      
Segment Reporting Information [Line Items]      
External revenues 48,477 28,896  
Intersegment revenues 91 11  
Depreciation and amortization 1,601 1,110  
Share-based compensation expense 290 134  
Interest expense 13 11  
Operating Income (Loss) 3,469 2,555  
Total assets 150,321 132,337  
Capital expenditures 81 52  
Elimination [Member]      
Segment Reporting Information [Line Items]      
Intersegment revenues (4,669) (1,515)  
Interest expense 357 270  
Operating Income (Loss) (1,335) (862)  
Total assets $ (217,300) $ (232,535)