Annual report pursuant to Section 13 and 15(d)

Leases (Details)

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Leases (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating lease renewal option, minimum (in years) 1 year    
Operating lease renewal option, maximum (in years) 10 years    
Operating lease original term, for tractors, trucks and trailers, minimum (in years) 2 years    
Operating lease original term, for tractors, trucks and trailers, maximum (in years) 6 years    
Finance lease, minimum remaining years in lease term 2 years    
Finance lease, maximum remaining years in lease term 7 years    
Sublease rental income $ 2,154 $ 1,724 $ 1,923
Costs incurred for independent owner operators 358,185 316,147 $ 317,452
Expected future sublease rental income 1,505    
Lease, Cost [Abstract]      
Finance Lease, Right-of-Use Asset, Amortization 1,019    
Finance Lease, Interest Payment on Liability 129    
Operating Lease, Cost 59,012    
Short-term Lease, Cost 12,056    
Variable Lease, Cost 373,181    
Sublease Income 2,154    
Lease, Cost 447,551    
Operating Lease, Payments 57,589    
Finance Lease, Principal Payments 946    
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability 8,188    
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability $ 202,278    
Finance Lease, Weighted Average Remaining Lease Term 4 years 7 months 6 days    
Operating Lease, Weighted Average Remaining Lease Term 3 years 9 months 18 days    
Finance Lease, Weighted Average Discount Rate, Percent 3.40%    
Operating Lease, Weighted Average Discount Rate, Percent 4.00%    
Operating Lease Liabilities, Payments Due [Abstract]      
2020 $ 61,804    
2021 46,755    
2022 31,918    
2023 22,088    
2024 14,775    
Thereafter 7,351    
Total minimum lease payments 184,691    
Less: amount of lease payments representing interest (32,551)    
Present value of future minimum lease payments 152,140    
Less: current portion of lease obligations (50,615) 0  
Long-term lease obligations 101,525 $ 0  
Finance Lease Liabilities, Payments, Due [Abstract]      
2020 1,611    
2021 1,610    
2022 1,342    
2023 1,200    
2024 798    
Thereafter 268    
Total minimum lease payments 6,829    
Less: amount of lease payments representing interest (499)    
Present value of future minimum lease payments 6,330    
Less: current portion of lease obligations (1,421)    
Long-term lease obligations $ 4,909    
Operating leases, minimum term of future equiment leases 3 years    
Operating leases, maximum term of future equiment leases 4 years