Derivative Financial Instruments Outstanding Derivative Contracts (Details) MMBTU in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($) MMBTU $ / Unit MBbls
Derivative [Line Items]
FV Commodity Derivatives Assets measured with Level 3	14.00%
Derivative, Fair Value, Net | $	$ 41,262
FV Commodity Derivatives Liabilities measured with Level 3	28.00%
Natural Gas [Member] | Collars
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	88,633
Natural Gas [Member] | Fixed Price Swaps
Derivative [Line Items]
Derivative, Fair Value, Net | $	$ (37,667)
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	41,500
Crude Oil [Member] | Collars
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MBbls	1,896
Crude Oil [Member] | Fixed Price Swaps
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MBbls	16,338
Derivative, Fair Value, Net | $	$ 98,233
2020 | Natural Gas [Member] | Collars
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	17,308
2020 | Natural Gas [Member] | Fixed Price Swaps
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	1,000
2020 | Crude Oil [Member] | Collars
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MBbls	900
2020 | Crude Oil [Member] | Fixed Price Swaps
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MBbls	3,174
Derivative, Fair Value, Net | $	$ 71,119
2021 | Natural Gas [Member] | Collars
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	62,625
2021 | Natural Gas [Member] | Fixed Price Swaps
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	31,800
2021 | Crude Oil [Member] | Collars
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MBbls	996
2021 | Crude Oil [Member] | Fixed Price Swaps
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MBbls	9,180
Derivative, Fair Value, Net | $	$ 40,547
2022 | Natural Gas [Member] | Collars
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	8,700
2022 | Natural Gas [Member] | Fixed Price Swaps
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	8,700
2022 | Crude Oil [Member] | Collars
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MBbls	0
2022 | Crude Oil [Member] | Fixed Price Swaps
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MBbls	3,984
Derivative, Fair Value, Net | $	$ (13,433)
Natural Gas [Member] | 2020 | Collars | CME SWAPS MARKETS (NYMEX) [Member]
Derivative [Line Items]
Derivative, Floor Price	2.02
Derivative, Cap Price	2.34
Natural Gas [Member] | 2020 | Fixed Price Swaps | CME SWAPS MARKETS (NYMEX) [Member]
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price	2.30
Natural Gas [Member] | 2020 | Fixed Price Swaps | CIG [Member]
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price	(0.48)
Natural Gas [Member] | 2020 | Fixed Price Swaps | Waha [Member]
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price	(1.40)
Natural Gas [Member] | 2021 | Collars | CME SWAPS MARKETS (NYMEX) [Member]
Derivative [Line Items]
Derivative, Floor Price	2.46
Derivative, Cap Price	2.86
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	(0.46)
Natural Gas [Member] | 2022 | Collars | CME SWAPS MARKETS (NYMEX) [Member]
Derivative [Line Items]
Derivative, Floor Price	2.50
Derivative, Cap Price	2.79
Natural Gas [Member] | 2022 | Fixed Price Swaps | CME SWAPS MARKETS (NYMEX) [Member]
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price	2.62
Natural Gas [Member] | 2022 | Fixed Price Swaps | CIG [Member]
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price	(0.36)
Crude Oil [Member] | 2020 | Collars | CME SWAPS MARKETS (NYMEX) [Member]
Derivative [Line Items]
Derivative, Floor Price	55.00
Derivative, Cap Price	71.68
Crude Oil [Member] | 2020 | Fixed Price Swaps | CME SWAPS MARKETS (NYMEX) [Member]
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price	58.90
Crude Oil [Member] | 2021 | Collars | CME SWAPS MARKETS (NYMEX) [Member]
Derivative [Line Items]
Derivative, Floor Price	35.00
Derivative, Cap Price	46.22
Crude Oil [Member] | 2021 | Fixed Price Swaps | CME SWAPS MARKETS (NYMEX) [Member]
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price	46.90
Crude Oil [Member] | 2022 | Collars | CME SWAPS MARKETS (NYMEX) [Member]
Derivative [Line Items]
Derivative, Floor Price	0
Derivative, Cap Price	0
Crude Oil [Member] | 2022 | Fixed Price Swaps | CME SWAPS MARKETS (NYMEX) [Member]
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price	40.01
CME SWAPS MARKETS (NYMEX) [Member] | 2020 | Natural Gas [Member] | Fixed Price Swaps
Derivative [Line Items]
Derivative, Fair Value, Net | $	$ (6,576)
CME SWAPS MARKETS (NYMEX) [Member] | 2021 | Natural Gas [Member] | Fixed Price Swaps
Derivative [Line Items]
Derivative, Fair Value, Net | $	(31,070)
CME SWAPS MARKETS (NYMEX) [Member] | 2022 | Natural Gas [Member] | Fixed Price Swaps
Derivative [Line Items]
Derivative, Fair Value, Net | $	(21)
Basis Protection - CIG [Member] | 2020 | Natural Gas [Member] | Fixed Price Swaps
Derivative [Line Items]
Derivative, Fair Value, Net | $	$ (4,627)
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	17,350
Basis Protection - CIG [Member] | 2021 | Natural Gas [Member] | Fixed Price Swaps
Derivative [Line Items]
Derivative, Fair Value, Net | $	$ (13,433)
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	94,425
Basis Protection - CIG [Member] | 2022 | Natural Gas [Member] | Fixed Price Swaps
Derivative [Line Items]
Derivative, Fair Value, Net | $	$ (733)
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	17,400
Basis Protection - Waha [Member] | 2020 | Natural Gas [Member] | Fixed Price Swaps
Derivative [Line Items]
Derivative, Fair Value, Net | $	$ (511)
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	1,000
Basis Protection Contracts Related to Natural Gas Marketing [Member] | Natural Gas [Member] | Fixed Price Swaps
Derivative [Line Items]
Derivative, Fair Value, Net | $	$ (19,304)
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	130,175