Derivative Financial Instruments Outstanding Derivative Contracts (Details) MMBTU in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2020 MMBTU $ / Unit	Mar. 31, 2020 USD ($) MMBTU $ / Unit MBbls
Derivative [Line Items]
FV Commodity Derivatives Assets measured with Level 3		16.50%
Derivative, Fair Value, Net | $		$ 411,799
FV Commodity Derivatives Liabilities measured with Level 3		19.30%
Natural Gas [Member]
Derivative [Line Items]
Derivative, Fair Value, Net | $		$ (1,850)
Crude Oil [Member]
Derivative [Line Items]
Derivative, Fair Value, Net | $		419,931
2020
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	21,200
Derivative, Floor Price	2.00
2020 | Crude Oil [Member]
Derivative [Line Items]
Derivative, Fair Value, Net | $		331,947
2021
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	15,600
Derivative, Floor Price	2.43
2021 | Crude Oil [Member]
Derivative [Line Items]
Derivative, Fair Value, Net | $		94,946
2022 [Member] | Crude Oil [Member]
Derivative [Line Items]
Derivative, Fair Value, Net | $		$ (6,962)
CIG [Member] | Natural Gas [Member] | 2020
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price		(0.62)
CIG [Member] | Natural Gas [Member] | 2021
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price		(0.50)
CME SWAPS MARKETS (NYMEX) [Member] | Natural Gas [Member] | 2021
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price		2.36
Derivative, Floor Price		2.25
Derivative, Cap Price		2.58
CME SWAPS MARKETS (NYMEX) [Member] | Natural Gas [Member] | 2020 [Member] [Domain]
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price		2.30
Derivative, Floor Price		2.00
Derivative, Cap Price		2.23
CME SWAPS MARKETS (NYMEX) [Member] | Crude Oil [Member] | 2020
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price		59.08
Derivative, Floor Price		55.00
Derivative, Cap Price		71.68
CME SWAPS MARKETS (NYMEX) [Member] | Crude Oil [Member] | 2021
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price		49.80
Derivative, Floor Price		0
Derivative, Cap Price		0
CME SWAPS MARKETS (NYMEX) [Member] | Crude Oil [Member] | 2022 [Member]
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price		34.88
Derivative, Floor Price		0
Derivative, Cap Price		0
Waha [Member] | Natural Gas [Member] | 2020
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price		(1.40)
Commodity Option [Member] | Natural Gas [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU		37,450
Commodity Option [Member] | Crude Oil [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MBbls		2,700
Commodity Option [Member] | 2020 | Crude Oil [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MBbls		2,700
Commodity Option [Member] | 2021 | Natural Gas [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU		22,200
Commodity Option [Member] | 2021 | Crude Oil [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MBbls		0
Commodity Option [Member] | 2022 [Member] | Crude Oil [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MBbls		0
Commodity Option [Member] | 2020 [Member] [Domain] | Natural Gas [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU		15,250
CME SWAPS MARKETS (NYMEX) [Member] | 2021 | Natural Gas [Member]
Derivative [Line Items]
Derivative, Fair Value, Net | $		$ (4,203)
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU		24,000
CME SWAPS MARKETS (NYMEX) [Member] | 2020 [Member] [Domain] | Natural Gas [Member]
Derivative [Line Items]
Derivative, Fair Value, Net | $		$ 2,353
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU		3,000
Basis Protection Contracts Related to Natural Gas Marketing [Member] | Natural Gas [Member]
Derivative [Line Items]
Derivative, Fair Value, Net | $		$ (6,282)
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU		64,575
Basis Protection - CIG [Member] | 2020 | Natural Gas [Member]
Derivative [Line Items]
Derivative, Fair Value, Net | $		$ (2,571)
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU		15,375
Basis Protection - CIG [Member] | 2021 | Natural Gas [Member]
Derivative [Line Items]
Derivative, Fair Value, Net | $		$ (2,195)
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU		46,200
Energy Related Derivative [Member] | Natural Gas [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU		27,000
Energy Related Derivative [Member] | Crude Oil [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MBbls		18,372
Energy Related Derivative [Member] | 2020 | Crude Oil [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MBbls		9,212
Energy Related Derivative [Member] | 2021 | Crude Oil [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MBbls		7,180
Energy Related Derivative [Member] | 2022 [Member] | Crude Oil [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MBbls		1,980
Basis Protection - Waha [Member] | 2020 | Natural Gas [Member]
Derivative [Line Items]
Derivative, Fair Value, Net | $		$ (1,516)
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU		3,000