Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Intangible assets
Weighted Average Life		16 years
Gross Carrying Amount		$ 109,215	$ 130,965
Accumulated Amortization		(39,386)	(49,767)
Amortization expense of intangible assets		11,369	11,302	$ 8,689
Estimated future amortization expense for intangible assets
2020		8,817
2021		7,577
2022		6,416
2023		5,581
2024		4,862
Thereafter		36,576
Total		$ 69,829	81,198
Tradename
Intangible assets
Weighted Average Life		9 years
Gross Carrying Amount		$ 16,040	31,390
Accumulated Amortization		(13,216)	(25,156)
Estimated future amortization expense for intangible assets
Total		$ 2,824	6,234
Tradename | Pipeline | Selling, general and administrative expenses
Intangible assets
Impairment of intangible asset	$ 500
Customer relationships
Intangible assets
Weighted Average Life		17 years
Gross Carrying Amount		$ 91,000	97,400
Accumulated Amortization		(24,353)	(23,079)
Estimated future amortization expense for intangible assets
Total		$ 66,647	74,321
Non-compete agreements
Intangible assets
Weighted Average Life		5 years
Gross Carrying Amount		$ 1,900	1,900
Accumulated Amortization		(1,580)	(1,387)
Estimated future amortization expense for intangible assets
Total		$ 320	513
Other
Intangible assets
Weighted Average Life		3 years
Gross Carrying Amount		$ 275	275
Accumulated Amortization		(237)	(145)
Estimated future amortization expense for intangible assets
Total		$ 38	$ 130