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Long-Term Debt (Details Textuals) shares in Millions			1 Months Ended	3 Months Ended		9 Months Ended	12 Months Ended
Long-Term Debt (Details Textuals) shares in Millions	Oct. 30, 2020 USD ($)	Sep. 18, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Jun. 30, 2020 USD ($) shares	Sep. 18, 2020 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Interest in guarantor subsidiaries							100.00%
Principal amount of debt cancelled		$ 2,100,000,000
Lease period included in long-term transportation service agreement							20 years
Shares issued upon conversion of notes \| shares					7.4
Debt principal balance net of debt discounts reclassified to equity					$ 13,900,000
Cash paid for debt repurchases			$ 14,200,000	$ 0		$ 14,171,000	$ 0	$ 0
Gain on debt extinguishment			19,000,000	0		18,994,000	0	$ 155,998,000
Unamortized debt issuance costs				$ 8,400,000			5,700,000
Senior Secured Bank Credit Facility [Abstract]
Borrowing base							575,000,000
Lender commitments		$ 575,000,000				$ 575,000,000	$ 575,000,000
Percentage reduction of borrowing base upon issuing or incurring unsecured debt, expressed as a percentage of the principal amount of unsecured debt							25.00%
Weighted average interest rate							4.00%
Commitment fee percentage							0.50%
Free State Pipeline
Debt Instrument [Line Items]
Payments to reacquire pipeline	$ 22,500,000
NEJD Pipeline
Debt Instrument [Line Items]
Payments to reacquire pipeline							$ 70,000,000
Letter of Credit
Senior Secured Bank Credit Facility [Abstract]
Line of credit facility, capacity available for specific purpose other than for trade purchases							100,000,000
Swingline Loan
Senior Secured Bank Credit Facility [Abstract]
Line of credit facility, capacity available for specific purpose other than for trade purchases							$ 25,000,000
Minimum
Senior Secured Bank Credit Facility [Abstract]
Percentage threshold for borrowing base property sales or hedge terminations that would prompt a borrowing base reduction							5.00%
Current ratio requirement							1.0
Minimum \| Dividend or Other Restricted Payment
Senior Secured Bank Credit Facility [Abstract]
Borrowing base availability requirement							20.00%
Maximum
Senior Secured Bank Credit Facility [Abstract]
Consolidated total debt to consolidated EBITDAX requirement							3.5
Maximum \| Dividend or Other Restricted Payment
Senior Secured Bank Credit Facility [Abstract]
Consolidated total debt to consolidated EBITDAX requirement							2
London Interbank Offered Rate (LIBOR)
Senior Secured Bank Credit Facility [Abstract]
Floor interest rate							1.00%
London Interbank Offered Rate (LIBOR) \| Minimum
Senior Secured Bank Credit Facility [Abstract]
Interest rate margins on senior secured bank credit facility							3.00%
London Interbank Offered Rate (LIBOR) \| Maximum
Senior Secured Bank Credit Facility [Abstract]
Interest rate margins on senior secured bank credit facility							4.00%
Base Rate \| Minimum
Senior Secured Bank Credit Facility [Abstract]
Interest rate margins on senior secured bank credit facility							2.00%
Base Rate \| Maximum
Senior Secured Bank Credit Facility [Abstract]
Interest rate margins on senior secured bank credit facility							3.00%
9% Senior Secured Second Lien Notes due 2021
Debt Instrument [Line Items]
Debt repurchases, face amount			$ 30,200,000
6 3/8% Convertible Senior Notes due 2024
Debt Instrument [Line Items]
Debt principal of notes converted					$ 19,900,000