Summary of Significant Accounting Policies (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) bbl MMBTU $ / MMBTU $ / Boe	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) bbl MMBTU $ / MMBTU $ / Boe	Sep. 30, 2019 USD ($)	Oct. 31, 2020 MMBTU bbl $ / MMBTU $ / Boe	Dec. 31, 2019 USD ($)
Property and Equipment
Proved oil and gas properties	$ 1,287,962		$ 1,287,962			$ 1,201,296
Unproved oil and gas properties	30,661		30,661			41,201
Furniture, fixtures, and other equipment	5,166		5,166			5,220
Less - Accumulated depreciation, depletion, and amortization	(787,830)		(787,830)			(380,728)
Net Furniture, Fixtures and other equipment	535,959		535,959			866,989
Disaggregation of Revenue [Line Items]
Oil and gas sales	45,699	$ 72,014	123,921	$ 218,781
Accounts Payable and Accrued Liabilities
Trade accounts payable	8,063		8,063			26,121
Accrued operating expenses	2,816		2,816			3,873
Accrued compensation costs	3,414		3,414			4,601
Asset retirement obligation - current portion	439		439			392
Accrued non-income based taxes	4,133		4,133			1,413
Accrued corporate and legal fees	162		162			109
Other payables	3,680		3,680			2,834
Total Accounts payable and accrued liabilities	22,707		22,707			$ 39,343
Oil sales [Member]
Disaggregation of Revenue [Line Items]
Oil and gas sales	17,665	28,894	40,979	68,441
Natural gas sales [Member]
Disaggregation of Revenue [Line Items]
Oil and gas sales	23,595	37,040	73,170	131,941
NGL sales [Member]
Disaggregation of Revenue [Line Items]
Oil and gas sales	$ 4,439	$ 6,080	$ 9,772	$ 18,400
Swap [Member] | First Quarter 2022 | Oil Derivative Swaps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | bbl	88,455		88,455
Derivative, Swap Type, Fixed Price | $ / Boe	36.79		36.79
Swap [Member] | Third Quarter 2022 | Oil Derivative Swaps [Member] | Subsequent Event [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | bbl					36,800
Derivative, Swap Type, Fixed Price | $ / Boe					43.38
Collar Contracts [Member] | First Quarter 2022 | Oil Derivative Swaps [Member] | Subsequent Event [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU					40,500
Derivative, Average Floor Price | $ / MMBTU					40.00
Derivative, Average Cap Price | $ / MMBTU					45.55
Collar Contracts [Member] | First Quarter 2022 | Natural Gas Derivative Swaps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU	4,415,000		4,415,000
Derivative, Average Floor Price | $ / MMBTU	2.50		2.50
Derivative, Average Cap Price | $ / MMBTU	3.35		3.35
Collar Contracts [Member] | Second Quarter 2022 | Oil Derivative Swaps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU	86,450		86,450
Derivative, Average Floor Price | $ / MMBTU	39.00		39.00
Derivative, Average Cap Price | $ / MMBTU	46.50		46.50
Collar Contracts [Member] | Second Quarter 2022 | Oil Derivative Swaps [Member] | Subsequent Event [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU					29,400
Derivative, Average Floor Price | $ / MMBTU					40.00
Derivative, Average Cap Price | $ / MMBTU					45.30
Collar Contracts [Member] | Second Quarter 2022 | Natural Gas Derivative Swaps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU	4,200,000		4,200,000
Derivative, Average Floor Price | $ / MMBTU	2.23		2.23
Derivative, Average Cap Price | $ / MMBTU	2.70		2.70
Collar Contracts [Member] | Third Quarter 2022 | Natural Gas Derivative Swaps [Member] | Subsequent Event [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU					920,000
Derivative, Average Floor Price | $ / MMBTU					2.35
Derivative, Average Cap Price | $ / MMBTU					2.65
Basis Swap [Member] | First Quarter 2022 | Natural Gas Basis Derivative Swaps [Member] | Subsequent Event [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU					1,800,000
Derivative, Swap Type, Fixed Price | $ / MMBTU					(0.08)
Basis Swap [Member] | Second Quarter 2022 | Natural Gas Basis Derivative Swaps [Member] | Subsequent Event [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU					1,820,000
Derivative, Swap Type, Fixed Price | $ / MMBTU					(0.08)
Basis Swap [Member] | Third Quarter 2022 | Natural Gas Basis Derivative Swaps [Member] | Subsequent Event [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU					1,840,000
Derivative, Swap Type, Fixed Price | $ / MMBTU					(0.08)
Basis Swap [Member] | Fourth Quarter 2022 | Natural Gas Basis Derivative Swaps [Member] | Subsequent Event [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU					1,840,000
Derivative, Swap Type, Fixed Price | $ / MMBTU					(0.08)