Derivative Financial Instruments Outstanding Derivative Contracts (Details) MMBTU in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2021 USD ($) MMBTU $ / Unit MBbls
Derivative [Line Items]
Derivative, Fair Value, Net | $	$ (479,800)
Natural Gas [Member] | Collars
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	54,000
Natural Gas [Member] | Fixed Price Swaps
Derivative [Line Items]
Derivative, Fair Value, Net | $	$ (75,248)
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	69,900
Crude Oil [Member] | Collars
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MBbls	6,054
Crude Oil [Member] | Fixed Price Swaps
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MBbls	16,322
Derivative, Fair Value, Net | $	$ (391,906)
2021 | Natural Gas [Member] | Collars
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	36,600
2021 | Natural Gas [Member] | Fixed Price Swaps
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	15,900
2021 | Crude Oil [Member] | Collars
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MBbls	2,502
2021 | Crude Oil [Member] | Fixed Price Swaps
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MBbls	4,976
Derivative, Fair Value, Net | $	$ (200,961)
2022 | Natural Gas [Member] | Collars
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	17,400
2022 | Natural Gas [Member] | Fixed Price Swaps
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	33,600
2022 | Crude Oil [Member] | Collars
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MBbls	3,552
2022 | Crude Oil [Member] | Fixed Price Swaps
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MBbls	6,744
Derivative, Fair Value, Net | $	$ (169,559)
2023 | Natural Gas [Member] | Collars
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	0
2023 | Natural Gas [Member] | Fixed Price Swaps
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	20,400
2023 | Crude Oil [Member] | Collars
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MBbls	0
2023 | Crude Oil [Member] | Fixed Price Swaps
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MBbls	4,602
Derivative, Fair Value, Net | $	$ (21,386)
Natural Gas [Member] | 2021 | Collars | CME SWAPS MARKETS (NYMEX) [Member]
Derivative [Line Items]
Derivative, Floor Price	2.51
Derivative, Cap Price	2.92
Natural Gas [Member] | 2021 | Fixed Price Swaps | CME SWAPS MARKETS (NYMEX) [Member]
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price	2.40
Natural Gas [Member] | 2021 | Fixed Price Swaps | CIG [Member]
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price	(0.44)
Natural Gas [Member] | 2022 | Collars | CME SWAPS MARKETS (NYMEX) [Member]
Derivative [Line Items]
Derivative, Floor Price	2.50
Derivative, Cap Price	2.89
Natural Gas [Member] | 2022 | Fixed Price Swaps | CME SWAPS MARKETS (NYMEX) [Member]
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price	2.70
Natural Gas [Member] | 2022 | Fixed Price Swaps | CIG [Member]
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price	(0.26)
Natural Gas [Member] | 2023 | Collars | CME SWAPS MARKETS (NYMEX) [Member]
Derivative [Line Items]
Derivative, Floor Price	0
Derivative, Cap Price	0
Natural Gas [Member] | 2023 | Fixed Price Swaps | CME SWAPS MARKETS (NYMEX) [Member]
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price	2.57
Natural Gas [Member] | 2023 | Fixed Price Swaps | CIG [Member]
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price	(0.23)
Crude Oil [Member] | 2021 | Collars | CME SWAPS MARKETS (NYMEX) [Member]
Derivative [Line Items]
Derivative, Floor Price	38.01
Derivative, Cap Price	49.29
Crude Oil [Member] | 2021 | Fixed Price Swaps | CME SWAPS MARKETS (NYMEX) [Member]
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price	41.89
Crude Oil [Member] | 2022 | Collars | CME SWAPS MARKETS (NYMEX) [Member]
Derivative [Line Items]
Derivative, Floor Price	49.49
Derivative, Cap Price	60.96
Crude Oil [Member] | 2022 | Fixed Price Swaps | CME SWAPS MARKETS (NYMEX) [Member]
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price	44.42
Crude Oil [Member] | 2023 | Collars | CME SWAPS MARKETS (NYMEX) [Member]
Derivative [Line Items]
Derivative, Floor Price	0
Derivative, Cap Price	0
Crude Oil [Member] | 2023 | Fixed Price Swaps | CME SWAPS MARKETS (NYMEX) [Member]
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price	56.23
CME SWAPS MARKETS (NYMEX) [Member] | 2021 | Natural Gas [Member] | Fixed Price Swaps
Derivative [Line Items]
Derivative, Fair Value, Net | $	$ (47,880)
CME SWAPS MARKETS (NYMEX) [Member] | 2022 | Natural Gas [Member] | Fixed Price Swaps
Derivative [Line Items]
Derivative, Fair Value, Net | $	(22,607)
CME SWAPS MARKETS (NYMEX) [Member] | 2023 | Natural Gas [Member] | Fixed Price Swaps
Derivative [Line Items]
Derivative, Fair Value, Net | $	(4,761)
Basis Protection - CIG [Member] | 2021 | Natural Gas [Member] | Fixed Price Swaps
Derivative [Line Items]
Derivative, Fair Value, Net | $	$ (12,885)
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	52,500
Basis Protection - CIG [Member] | 2022 | Natural Gas [Member] | Fixed Price Swaps
Derivative [Line Items]
Derivative, Fair Value, Net | $	$ (1,130)
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	51,000
Basis Protection - CIG [Member] | 2023 | Natural Gas [Member] | Fixed Price Swaps
Derivative [Line Items]
Derivative, Fair Value, Net | $	$ 1,369
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	20,400
Basis Protection Contracts Related to Natural Gas Marketing [Member] | Natural Gas [Member] | Fixed Price Swaps
Derivative [Line Items]
Derivative, Fair Value, Net | $	$ (12,646)
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	123,900