Leases - Summary of Lease Related Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Amortization of asset	$ 0	$ 420
Interest on lease liabilities	372	202
Sublease Income	(1,118)	(1,419)
Net lease expense	314,427	400,764
Variable lease expenses primarily related to additional volumes processed at natural gas processing plant	21,800	28,700
Lease operating expenses	600,076	605,180	$ 353,832
Property, plant and equipment
Lessee, Lease, Description [Line Items]
Operating lease cost	40,227	133,837
Lease operating expenses	25,000	102,700
Asset retirement obligations
Lessee, Lease, Description [Line Items]
Operating lease cost	0	3,024
Lease operating expenses		3,000
Lease operating expenses
Lessee, Lease, Description [Line Items]
Operating lease cost	208,104	208,674
Lease operating expenses	73,900	56,300
Transportation, gathering and processing
Lessee, Lease, Description [Line Items]
Operating lease cost	39,121	41,113
Lease operating expenses	22,900
Selling and general expense
Lessee, Lease, Description [Line Items]
Operating lease cost	10,638	12,325
Lease operating expenses	3,300	4,300
Other operating expense
Lessee, Lease, Description [Line Items]
Operating lease cost	9,524	2,588
Lease operating expenses	2,500	2,600
Impairment of assets
Lessee, Lease, Description [Line Items]
Operating lease cost	6,565	0
Exploration Expenses
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 994	$ 0