Derivative Financial Instruments (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Summary of location and aggregate fair value of all derivative financial instruments recorded in the consolidated statements of operations
Realized gain on derivatives	$ 38,937	$ 9,482	$ 2,334
Unrealized (loss) gain on derivatives	(32,008)	(53,727)	65,085
Revenues
Summary of location and aggregate fair value of all derivative financial instruments recorded in the consolidated statements of operations
Realized gain on derivatives	38,937	9,482	2,334
Unrealized (loss) gain on derivatives	(32,008)	(53,727)	65,085
Total	6,929	(44,245)	67,419
Oil | Revenues
Summary of location and aggregate fair value of all derivative financial instruments recorded in the consolidated statements of operations
Realized gain on derivatives	38,937	9,026	3,741
Unrealized (loss) gain on derivatives	(37,703)	(53,443)	65,991
Natural Gas | Revenues
Summary of location and aggregate fair value of all derivative financial instruments recorded in the consolidated statements of operations
Realized gain on derivatives	0	456	(1,407)
Unrealized (loss) gain on derivatives	$ 5,695	$ (284)	$ (906)