Summary of Significant Accounting Policies (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jul. 31, 2020 MMBTU $ / MMBTU	Dec. 31, 2019 USD ($)
Property and Equipment
Proved oil and gas properties	$ 1,268,374		$ 1,268,374			$ 1,201,296
Unproved oil and gas properties	30,043		30,043			41,201
Furniture, fixtures, and other equipment	5,134		5,134			5,220
Less - Accumulated depreciation, depletion, and amortization	(773,836)		(773,836)			(380,728)
Net Furniture, Fixtures and other equipment	529,715		529,715			866,989
Disaggregation of Revenue [Line Items]
Oil and gas sales	24,846	$ 74,703	78,222	$ 146,768
Accounts Payable and Accrued Liabilities
Trade accounts payable	5,466		5,466			26,121
Accrued operating expenses	2,587		2,587			3,873
Accrued compensation costs	2,784		2,784			4,601
Asset retirement obligation - current portion	382		382			392
Accrued non-income based taxes	3,102		3,102			1,413
Accrued corporate and legal fees	158		158			109
Other payables	1,321		1,321			2,834
Total Accounts payable and accrued liabilities	15,800		15,800			$ 39,343
Oil sales [Member]
Disaggregation of Revenue [Line Items]
Oil and gas sales	5,265	24,940	23,315	39,547
Natural gas sales [Member]
Disaggregation of Revenue [Line Items]
Oil and gas sales	18,103	43,597	49,574	94,902
NGL sales [Member]
Disaggregation of Revenue [Line Items]
Oil and gas sales	$ 1,478	$ 6,166	$ 5,333	$ 12,319
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					86,450
Derivative, Average Floor Price | $ / MMBTU					39.00
Derivative, Average Cap Price | $ / MMBTU					46.50