Derivative Instruments - Effect of Derivative Instruments on the Condensed Consolidated Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Cash received (paid) on settlement of derivative instruments, gain (loss) on derivative instruments	$ (64,351)	$ 14,106	$ (61,302)	$ 33,529
Non-cash gain (loss) on derivative instruments, gain (loss) on derivative instruments	(136,931)	(56,359)	(240,339)	(15,746)
Gain (loss) on derivative instruments	$ (201,282)	$ (42,253)	$ (301,641)	$ 17,783