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Fair Value Measurements - Hierarchy of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - Recurring - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets:
Permian Basin Sale Contingent Consideration	$ 39,717
Commodity derivative instruments		$ 467
Total assets	39,717	467
Liabilities:
Commodity derivative instruments	408,853	94,558
Total liabilities	408,853	94,558
Level 1
Assets:
Permian Basin Sale Contingent Consideration	0
Commodity derivative instruments		0
Total assets	0	0
Liabilities:
Commodity derivative instruments	0	0
Total liabilities	0	0
Level 2
Assets:
Permian Basin Sale Contingent Consideration	39,717
Commodity derivative instruments		467
Total assets	39,717	467
Liabilities:
Commodity derivative instruments	408,853	94,558
Total liabilities	408,853	94,558
Level 3
Assets:
Permian Basin Sale Contingent Consideration	0
Commodity derivative instruments		0
Total assets	0	0
Liabilities:
Commodity derivative instruments	0	0
Total liabilities	$ 0	$ 0

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