Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 197,897		$ 197,897		$ 189,102
Less accumulated depreciation and amortization	(107,158)		(107,158)		(94,968)
Property and equipment, net	90,739		90,739		94,134
Total depreciation and amortization	4,849	$ 4,859	14,703	$ 13,610
Assets not held under finance leases
Property, Plant and Equipment [Line Items]
Total depreciation and amortization	3,665	4,237	11,169	11,882
Assets held under finance leases
Property, Plant and Equipment [Line Items]
Total depreciation and amortization	1,184	$ 622	$ 3,534	$ 1,728
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	103,934		$ 103,934		101,813
Tractors and trailers | Assets held under finance leases
Property, Plant and Equipment [Line Items]
Less accumulated depreciation and amortization	(8,500)		$ (8,500)		(5,000)
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	22,819		$ 22,819		22,139
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
Finance lease ROU assets
Property, Plant and Equipment [Line Items]
Property and equipment, gross	22,349		$ 22,349		20,266
Finance lease ROU assets | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life			3 years
Finance lease ROU assets | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life			6 years
Pipeline and related facilities
Property, Plant and Equipment [Line Items]
Property and equipment, gross	20,336		$ 20,336		21,265
Pipeline and related facilities | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life			20 years
Pipeline and related facilities | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life			25 years
Linefill and base gas
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,922		$ 3,922		3,333
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment, gross	16,108		$ 16,108		14,977
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	2,060		$ 2,060		1,893
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	2,008		$ 2,008		1,790
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 4,361		$ 4,361		$ 1,626