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Leases (Details) $ in Thousands		3 Months Ended		6 Months Ended
Leases (Details) $ in Thousands	May 17, 2020 trailer	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Lease, Cost [Abstract]
Amortization of ROU assets		$ 553	$ 456	$ 1,106	$ 701
Interest on lease liabilities		68	81	142	127
Operating lease cost		678	717	1,357	1,579
Short-term lease cost		2,169	2,863	4,671	4,828
Total lease expense		$ 3,468	$ 4,117	7,276	7,235
Operating cash flows from operating leases				1,354	1,274
Operating cash flows from finance leases				201	94
Financing cash flows from finance leases				1,070	651
ROU assets obtained in exchange for new lease liabilities, Finance leases				1,656	4,148
ROU assets obtained in exchange for new lease liabilities, Operating leases				$ 162	$ 11,111
Weighted-average remaining lease term (years), Finance leases		4 years 4 months 24 days	3 years 6 months 7 days	4 years 4 months 24 days	3 years 6 months 7 days
Weighted-average remaining lease term (years), Operating leases		4 years 4 months 17 days	5 years 2 months 26 days	4 years 4 months 17 days	5 years 2 months 26 days
Weighted-average discount rate, Finance leases		4.20%	4.90%	4.20%	4.90%
Weighted-average discount rate, Operating leases		5.00%	5.00%	5.00%	5.00%
Assets and Liabilities, Lessee [Abstract]
Finance lease ROU assets		$ 6,934		$ 6,934		$ 6,384
Operating lease ROU assets		8,599		8,599		9,576
Finance lease liabilities, Current		2,482		2,482		2,167
Operating lease liabilities, Current		2,159		2,159		2,252
Finance lease liabilities, Noncurrent		4,647		4,647		4,376
Operating lease liabilities, Noncurrent		6,442		6,442		7,323
Finance Lease Liabilities, Payments
Remainder of 2020		1,361		1,361
2021		2,723		2,723		2,426
2022		1,789		1,789		2,426
2023		939		939		1,492
2024		336		336		642
Thereafter		446		446
2024						37
Thereafter						0
Total lease payments		7,594		7,594		7,023
Less: Interest		(465)		(465)		(480)
Present value of lease liabilities		7,129		7,129		6,543
Less: Current portion of lease obligation		(2,482)		(2,482)		(2,167)
Finance lease obligations		4,647		4,647		4,376
Operating Lease Liabilities, Payments Due
Remainder of 2020		1,350		1,350
2021		2,311		2,311		2,660
2022		1,968		1,968		2,256
2023		1,789		1,789		1,914
2024		1,671		1,671		1,776
Thereafter		444		444
2024						1,668
Thereafter						443
Total lease payments		9,533		9,533		10,717
Less: Interest		(932)		(932)		(1,142)
Present value of lease liabilities		8,601		8,601		9,575
Less: Current portion of lease obligation		(2,159)		(2,159)		(2,252)
Total long-term lease obligation		$ 6,442		$ 6,442		$ 7,323
Comcar
Schedule of Asset Acquisition [Line Items]
Finance leased arrangements, number of trailers \| trailer	40
Comcar \| Trailers
Schedule of Asset Acquisition [Line Items]
Useful life	6 years