Divestitures - BP Transaction (Details) $ in Thousands					1 Months Ended		9 Months Ended	12 Months Ended			21 Months Ended
	Mar. 01, 2019 USD ($)	Jun. 22, 2017 USD ($)	Mar. 31, 2017 USD ($)	Feb. 27, 2017 USD ($) facility	Dec. 31, 2019 USD ($)	Feb. 28, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2018 USD ($)
Acquisitions and Divestitures
Asset purchase agreement, gain from sale of certain assets of subsidiary								$ 7,455	$ 4,782	$ 70,658
Goodwill					$ 64,328		$ 64,328	64,328	64,328	64,328	$ 64,328
BP Products North America, Inc.
Acquisitions and Divestitures
Production facilities to be developed | facility				2
Asset purchase agreement, amount			$ 155,500
Extinguishment of debt, amount			8,800
Asset purchase agreement, cash paid	$ 5,400		30,000			$ 900	1,000
Asset purchase agreement, accrued amount					900			900
Asset purchase agreement, debt instrument, face amount			123,500
Asset purchase agreement, post-closing adjustments, payment		$ 2,000
Asset purchase agreement, gain from sale of certain assets of subsidiary					8,400					70,700	$ 800
Goodwill							26,600			26,600
Asset purchase agreement, contingent consideration (up to)				$ 25,000				7,500	$ 4,800	$ 800
Asset purchase agreement, contingent consideration, term				5 years
Asset purchase agreement, payment of transaction costs			$ 3,700		$ 2,800	$ 100	$ 9,200	$ 600
Asset purchase agreement, shares issued (in shares) | shares						15,877	770,269
Asset purchase agreement, shares issued, value						$ 0	$ 2,000
Proceeds from sale of other assets							$ 142,200
Maximum | BP Products North America, Inc.
Acquisitions and Divestitures
Asset purchase agreement, contingent consideration, term					5 years
Minimum | BP Products North America, Inc.
Acquisitions and Divestitures
Asset purchase agreement, contingent consideration, term					4 years