Property and Equipment - Cost of Property and Equipment and Related Accumulated Depreciaiton, Depletion, and Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment gross under finance leases	$ 164,244
Property and equipment, gross		$ 139,441
Less accumulated depreciation, depletion and amortization under finance leases	(95,198)
Less accumulated depreciation, depletion and amortization		(94,818)
Property and equipment, net under finance leases	69,046
Property and equipment, net	69,046	44,623
Depreciation, depletion and amortization	16,641	10,654	$ 13,599
Amortization of property and equipment under finance leases	1,807
Marketing
Property, Plant and Equipment [Line Items]
Depreciation, depletion and amortization	$ 8,741	6,384	7,812
Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	2 years
Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	39 years
Tractors and trailers
Property, Plant and Equipment [Line Items]
Property and equipment gross under finance leases	$ 115,693
Property and equipment, gross		96,523
Tractors and trailers | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	5 years
Tractors and trailers | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	6 years
Field equipment
Property, Plant and Equipment [Line Items]
Property and equipment gross under finance leases	$ 25,094
Property and equipment, gross		20,725
Less accumulated depreciation, depletion and amortization under finance leases	(700)
Field equipment | Marketing
Property, Plant and Equipment [Line Items]
Property and equipment gross under finance leases	$ 3,300
Field equipment | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	2 years
Field equipment | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	5 years
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment gross under finance leases	$ 16,055
Property and equipment, gross		15,746
Buildings | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	5 years
Buildings | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	39 years
Office equipment
Property, Plant and Equipment [Line Items]
Property and equipment gross under finance leases	$ 1,951
Property and equipment, gross		1,863
Office equipment | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	2 years
Office equipment | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	5 years
Land
Property, Plant and Equipment [Line Items]
Property and equipment gross under finance leases	$ 1,790
Property and equipment, gross		1,790
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment gross under finance leases	3,661
Property and equipment, gross		2,794
Tractors
Property, Plant and Equipment [Line Items]
Property and equipment gross under finance leases	5,500
Property and equipment, gross		4,700
Less accumulated depreciation, depletion and amortization under finance leases	(1,700)
Less accumulated depreciation, depletion and amortization		(700)
Assets not held under finance leases
Property, Plant and Equipment [Line Items]
Depreciation, depletion and amortization	14,833
Assets not held under capital leases
Property, Plant and Equipment [Line Items]
Depreciation, depletion and amortization		10,112	13,478
Assets held under finance leases
Property, Plant and Equipment [Line Items]
Amortization of property and equipment under finance leases	$ 1,808
Assets held under capital leases
Property, Plant and Equipment [Line Items]
Depreciation, depletion and amortization		$ 542	$ 121