Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 194,083		$ 194,083		$ 189,102
Less accumulated depreciation and amortization	(103,506)		(103,506)		(94,968)
Property and equipment, net	90,577		90,577		94,134
Total depreciation and amortization	4,801	$ 4,278	9,854	$ 8,751
Assets not held under finance leases
Property, Plant and Equipment [Line Items]
Total depreciation and amortization	3,591	3,725	7,504	7,645
Assets held under finance leases
Property, Plant and Equipment [Line Items]
Total depreciation and amortization	1,210	$ 553	$ 2,350	$ 1,106
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	100,899		$ 100,899		101,813
Tractors and trailers | Assets held under finance leases
Property, Plant and Equipment [Line Items]
Less accumulated depreciation and amortization	(7,400)		$ (7,400)		(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	22,779		$ 22,779		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	19,946		$ 19,946		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	3,333		$ 3,333		3,333
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment, gross	16,044		$ 16,044		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	1,951		$ 1,951		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	$ 4,774		$ 4,774		$ 1,626