Summary of Significant Accounting Policies (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) MMBTU bbl $ / MMBTU $ / Boe	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) MMBTU bbl $ / MMBTU $ / Boe	Jun. 30, 2020 USD ($)	Jul. 30, 2021 MMBTU bbl $ / MMBTU $ / Boe	Dec. 31, 2020 USD ($)
Property and Equipment
Proved oil and gas properties | $	$ 1,372,163		$ 1,372,163			$ 1,310,008
Unproved oil and gas properties | $	24,312		24,312			28,090
Furniture, fixtures, and other equipment | $	5,727		5,727			5,275
Less - Accumulated depreciation, depletion, and amortization | $	(830,749)		(830,749)			(801,279)
Net Furniture, Fixtures and other equipment | $	571,453		571,453			542,094
Disaggregation of Revenue [Line Items]
Oil and gas sales | $	69,861	$ 24,846	156,602	$ 78,222
Accounts Payable and Accrued Liabilities
Trade accounts payable | $	8,736		8,736			15,930
Accrued operating expenses | $	2,873		2,873			2,491
Accrued compensation costs | $	2,579		2,579			3,771
Asset retirement obligation - current portion | $	515		515			441
Accrued non-income based taxes | $	2,517		2,517			1,819
Accrued corporate and legal fees | $	143		143			150
Other payables | $	6,524		6,524			2,389
Total Accounts payable and accrued liabilities | $	23,887		23,887			$ 26,991
Oil sales [Member]
Disaggregation of Revenue [Line Items]
Oil and gas sales | $	15,890	5,265	33,356	23,315
Natural gas sales [Member]
Disaggregation of Revenue [Line Items]
Oil and gas sales | $	46,791	18,103	109,705	49,574
NGL sales [Member]
Disaggregation of Revenue [Line Items]
Oil and gas sales | $	$ 7,180	$ 1,478	$ 13,541	$ 5,333
Swap [Member] | Third Quarter 2021 [Member] | Oil Derivative Swaps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | bbl	179,759		179,759
Derivative, Swap Type, Fixed Price | $ / Boe	51.19		51.19
Swap [Member] | Third Quarter 2021 [Member] | Oil Derivative Swaps [Member] | Subsequent Event [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | bbl					30,000
Derivative, Swap Type, Fixed Price | $ / Boe					70.75
Swap [Member] | Third Quarter 2021 [Member] | Swap Purchase | Subsequent Event [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | bbl					12,000
Derivative, Swap Type, Fixed Price | $ / Boe					72.76
Swap [Member] | Third Quarter 2021 [Member] | Natural Gas Derivative Swaps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU	330,000		330,000
Derivative, Swap Type, Fixed Price	2.62		2.62
Swap [Member] | Third Quarter 2021 [Member] | Natural Gas Derivative Swaps [Member] | Subsequent Event [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU					610,000
Derivative, Swap Type, Fixed Price					4.00
Swap [Member] | Third Quarter 2021 [Member] | NGL Derivative
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | bbl	192,324		192,324
Derivative, Swap Type, Fixed Price	24.26		24.26
Swap [Member] | Fourth Quarter 2021 [Member] | Oil Derivative Swaps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | bbl	191,412		191,412
Derivative, Swap Type, Fixed Price | $ / Boe	53.60		53.60
Swap [Member] | Fourth Quarter 2021 [Member] | Oil Derivative Swaps [Member] | Subsequent Event [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | bbl					81,250
Derivative, Swap Type, Fixed Price | $ / Boe					66.69
Swap [Member] | Fourth Quarter 2021 [Member] | Natural Gas Derivative Swaps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU	290,000		290,000
Derivative, Swap Type, Fixed Price	2.69		2.69
Swap [Member] | Fourth Quarter 2021 [Member] | Natural Gas Derivative Swaps [Member] | Subsequent Event [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU					1,240,000
Derivative, Swap Type, Fixed Price					3.90
Swap [Member] | Fourth Quarter 2021 [Member] | NGL Derivative
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | bbl	192,324		192,324
Derivative, Swap Type, Fixed Price	24.26		24.26
Swap [Member] | First Quarter 2022 | Oil Derivative Swaps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | bbl	178,455		178,455
Derivative, Swap Type, Fixed Price | $ / Boe	45.77		45.77
Swap [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 | bbl					45,000
Derivative, Swap Type, Fixed Price | $ / Boe					63.37
Swap [Member] | First Quarter 2022 | NGL Derivative
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | bbl	45,000		45,000
Derivative, Swap Type, Fixed Price	23.52		23.52
Swap [Member] | First Quarter 2022 | NGL Derivative | Subsequent Event [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | bbl					45,000
Derivative, Swap Type, Fixed Price					26.32
Swap [Member] | Second Quarter 2022 | Oil Derivative Swaps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | bbl	91,000		91,000
Derivative, Swap Type, Fixed Price | $ / Boe	54.00		54.00
Swap [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 | bbl					45,500
Derivative, Swap Type, Fixed Price | $ / Boe					62.00
Swap [Member] | Second 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					3,795,000
Derivative, Swap Type, Fixed Price					2.99
Swap [Member] | Second Quarter 2022 | NGL Derivative | Subsequent Event [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | bbl					45,500
Derivative, Swap Type, Fixed Price					26.32
Swap [Member] | Third Quarter 2022 | Oil Derivative Swaps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | bbl	200,100		200,100
Derivative, Swap Type, Fixed Price | $ / Boe	47.05		47.05
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					46,000
Derivative, Swap Type, Fixed Price | $ / Boe					60.81
Swap [Member] | Third Quarter 2022 | Natural Gas Derivative Swaps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU	2,100		2,100
Derivative, Swap Type, Fixed Price	2.50		2.50
Swap [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					4,140,000
Derivative, Swap Type, Fixed Price					3.02
Swap [Member] | Third Quarter 2022 | NGL Derivative | Subsequent Event [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | bbl					46,000
Derivative, Swap Type, Fixed Price					26.32
Swap [Member] | Fourth Quarter 2022 | Oil Derivative Swaps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | bbl	138,000		138,000
Derivative, Swap Type, Fixed Price | $ / Boe	53.20		53.20
Swap [Member] | Fourth Quarter 2022 | Oil Derivative Swaps [Member] | Subsequent Event [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | bbl					46,000
Derivative, Swap Type, Fixed Price | $ / Boe					59.75
Swap [Member] | Fourth 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					2,760,000
Derivative, Swap Type, Fixed Price					3.14
Swap [Member] | Fourth Quarter 2022 | NGL Derivative | Subsequent Event [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | bbl					46,000
Derivative, Swap Type, Fixed Price					26.32
Swap [Member] | First Quarter 2023 | Oil Derivative Swaps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | bbl	81,900		81,900
Derivative, Swap Type, Fixed Price | $ / Boe	55.70		55.70
Collar Contracts [Member] | Third Quarter 2021 [Member] | Oil Derivative Swaps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU	90,620		90,620
Derivative, Average Floor Price	34.34		34.34
Derivative, Average Cap Price	39.87		39.87
Collar Contracts [Member] | Third Quarter 2021 [Member] | Natural Gas Derivative Swaps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU	8,185,175		8,185,175
Derivative, Average Floor Price	2.36		2.36
Derivative, Average Cap Price	2.82		2.82
Collar Contracts [Member] | Fourth Quarter 2021 [Member] | Oil Derivative Swaps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU	84,640		84,640
Derivative, Average Floor Price	34.70		34.70
Derivative, Average Cap Price	41.01		41.01
Collar Contracts [Member] | Fourth Quarter 2021 [Member] | Natural Gas Derivative Swaps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU	8,991,000		8,991,000
Derivative, Average Floor Price	2.61		2.61
Derivative, Average Cap Price	2.98		2.98
Collar Contracts [Member] | First Quarter 2022 | Oil Derivative Swaps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU	40,500		40,500
Derivative, Average Floor Price	40.00		40.00
Derivative, Average Cap Price	45.55		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	8,465,000		8,465,000
Derivative, Average Floor Price	2.72		2.72
Derivative, Average Cap Price	3.36		3.36
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	115,850		115,850
Derivative, Average Floor Price	39.25		39.25
Derivative, Average Cap Price	46.20		46.20
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	5,246,500		5,246,500
Derivative, Average Floor Price	2.15		2.15
Derivative, Average Cap Price	2.60		2.60
Collar Contracts [Member] | Third Quarter 2022 | Natural Gas Derivative Swaps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU	4,899,000		4,899,000
Derivative, Average Floor Price	2.39		2.39
Derivative, Average Cap Price	2.72		2.72
Collar Contracts [Member] | Fourth Quarter 2022 | Natural Gas Derivative Swaps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU	4,545,076		4,545,076
Derivative, Average Floor Price	2.41		2.41
Derivative, Average Cap Price	2.88		2.88
Collar Contracts [Member] | Fourth 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					1,380,000
Derivative, Average Floor Price					2.90
Derivative, Average Cap Price					3.34
Collar Contracts [Member] | First Quarter 2023 | Natural Gas Derivative Swaps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU	4,297,000		4,297,000
Derivative, Average Floor Price	2.62		2.62
Derivative, Average Cap Price	3.11		3.11
Collar Contracts [Member] | First Quarter 2023 | Natural Gas Derivative Swaps [Member] | Subsequent Event [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU					1,350,000
Derivative, Average Floor Price					2.95
Derivative, Average Cap Price					3.51
Collar Contracts [Member] | Second Quarter 2023 | Oil Derivative Swaps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU	36,400		36,400
Derivative, Average Floor Price	56.00		56.00
Derivative, Average Cap Price	63.20		63.20
Collar Contracts [Member] | Second Quarter 2023 | Natural Gas Derivative Swaps [Member] | Subsequent Event [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU					2,275,000
Derivative, Average Floor Price					2.40
Derivative, Average Cap Price					2.84