Quarterly report pursuant to Section 13 or 15(d)

Acquisitions and Long-Lived Assets - Expedited Freight Acquisitions (Details)

v3.20.1
Acquisitions and Long-Lived Assets - Expedited Freight Acquisitions (Details)
$ in Thousands
3 Months Ended
Apr. 21, 2019
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Jan. 12, 2020
USD ($)
Dec. 31, 2019
Segment Reporting Information [Line Items]          
Change in fair value of earn-out liability   $ (594) $ 0    
Linn Star [Member]          
Segment Reporting Information [Line Items]          
Business Acquisition, Cash Paid       $ 57,239  
Number of additional locations       20  
FSA [Member]          
Segment Reporting Information [Line Items]          
Business Acquisition, Cash Paid $ 27,000        
Business Combination, Contingent Consideration, Liability $ 15,000 11,176      
Period of years which earnout is calculated 2 years        
Business Combination, Contingent Consideration, Liability, Current $ 11,803 5,661      
Change in fair value of earn-out liability   594      
Expected future contingent consideration liability   $ 12,583      
Risk Free Interest Rate [Member] | FSA [Member]          
Segment Reporting Information [Line Items]          
Business Combination, Contingent Consideration, Liability, Measurement Input Percentage 2.90% 4.50%     2.20%
Revenue Discount Rate [Member] | FSA [Member]          
Segment Reporting Information [Line Items]          
Business Combination, Contingent Consideration, Liability, Measurement Input Percentage 4.40% 3.10%     4.40%
Revenue Volatility [Member] | FSA [Member]          
Segment Reporting Information [Line Items]          
Business Combination, Contingent Consideration, Liability, Measurement Input Percentage 3.00% 6.00%     5.00%