Derivative Instruments and Hedging Activities- Location of Gain Loss in Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Trading Activity, Gains and Losses, Net [Line Items]
Net unrealized gain (loss) recognized in other comprehensive income	$ 960	$ 2,492	$ 1,742	$ (3,918)
Gain (loss) reclassified into earnings	52	(4,586)	(18,772)	(3,411)
Commodity contracts
Trading Activity, Gains and Losses, Net [Line Items]
Net unrealized gain (loss) recognized in other comprehensive income	960	2,492	1,742	(3,918)
Commodity contracts | Sales and other revenues
Trading Activity, Gains and Losses, Net [Line Items]
Gain (loss) reclassified into earnings	(468)	(5,217)	(19,239)	(5,168)
Commodity contracts | Cost of products sold
Trading Activity, Gains and Losses, Net [Line Items]
Gain (loss) reclassified into earnings	0	983	0	3,272
Commodity contracts | Operating expenses
Trading Activity, Gains and Losses, Net [Line Items]
Gain (loss) reclassified into earnings	$ 520	$ (352)	$ 467	$ (1,515)