Leases (Details) $ in Thousands		12 Months Ended
	May 17, 2020 tractor trailer	Dec. 31, 2021 USD ($) finance_lease	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Leases [Abstract]
Operating lease, liability		$ 7,116	$ 8,050
Lessee, Lease, Description [Line Items]
Number of finance lease agreements with residual value guarantee provisions | finance_lease		5
Finance lease liabilities with residual value guarantee provisions		$ 2,200
Lease, Cost [Abstract]
Amortization of ROU assets		4,744	2,547	$ 1,807
Interest on lease liabilities		413	300	295
Operating lease cost		2,560	2,718	2,933
Short-term lease cost		13,880	11,020	9,627
Variable lease cost		7	0	0
Total lease expense		21,604	16,585	14,662
Cash paid for amounts included in measurement of lease liabilities:
Operating cash flows from operating leases		2,560	2,717	2,934
Operating cash flows from finance leases		326	291	295
Financing cash flows from finance leases		$ 4,367	$ 2,336	1,697
ROU assets obtained in exchange for new lease liabilities:
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]		Property and equipment, net	Property and equipment, net
Finance leases		$ 2,083	$ 11,412	4,148
Operating leases		$ 1,385	$ 819	$ 12,006
Weighted-average remaining lease term (years):
Finance leases		3 years 7 months 6 days	4 years 1 month 28 days	3 years 10 days
Operating leases		3 years 10 months 6 days	4 years 6 months 25 days	4 years 9 months 10 days
Weighted-average discount rate:
Finance leases		2.60%	3.00%	4.90%
Operating leases		3.80%	4.30%	5.00%
Assets and Liabilities
Finance lease, ROU assets		$ 12,590	$ 15,251
Operating lease right-of-use assets, net		7,113	8,051
Current portion of finance lease obligations		3,663	4,112
Operating lease, liability, current		2,178	2,050
Finance lease, liability, noncurrent		9,672	11,507
Operating lease, liability, noncurrent		4,938	6,000
Finance Lease
2022		3,941	4,496
2023		3,143	3,562
2024		2,348	2,764
2025		3,771	1,969
2026		801	2,992
Thereafter		0	802
Total lease payments		14,004	16,585
Less: Interest		(669)	(966)
Present value of lease liabilities		13,335	15,619
Less: Current portion of lease obligation		(3,663)	(4,112)
Total long-term lease obligation		9,672	11,507
Operating Lease
2022		2,399	2,343
2023		2,080	2,002
2024		1,911	1,821
2025		394	1,700
2026		333	222
Thereafter		455	675
Total lease payments		7,572	8,763
Less: Interest		(456)	(713)
Present value of lease liabilities		7,116	8,050
Less: Current portion of lease obligation		(2,178)	(2,050)
Total long-term lease obligation		$ 4,938	$ 6,000
Comcar
Lessee, Lease, Description [Line Items]
Finance leased arrangements, number of tractors | tractor	58
Finance leased arrangements, number of trailers | trailer	40
Comcar | Tractors
Lessee, Lease, Description [Line Items]
Useful life	5 years
Comcar | Trailers
Lessee, Lease, Description [Line Items]
Useful life	6 years
Minimum
Lessee, Lease, Description [Line Items]
Leases, weighted average remaining lease term		1 year
Maximum
Lessee, Lease, Description [Line Items]
Leases, weighted average remaining lease term		8 years