Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 161,744		$ 164,244
Less accumulated depreciation	(96,363)		(95,198)
Property and equipment, net	65,381		69,046
Total depreciation and amortization	$ 4,473	$ 3,589
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
Assets not held under finance eases
Property, Plant and Equipment [Line Items]
Total depreciation and amortization	$ 3,920	3,344
Assets held under finance leases
Property, Plant and Equipment [Line Items]
Total depreciation and amortization	553	$ 245
Tractors and trailers
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 116,509		115,693
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
Tractors and trailers | Assets held under finance leases
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 5,500		5,500
Less accumulated depreciation	(2,000)		(1,700)
Field equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 25,149		25,094
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
Field equipment | Assets held under finance leases
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 3,300		3,300
Less accumulated depreciation	(1,000)		(700)
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 16,055		16,055
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	$ 1,958		1,951
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	$ 1,790		1,790
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 283		$ 3,661