Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details Textual)	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) purchaser	Dec. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) $ / bbl	Dec. 31, 2021 USD ($) $ / MMBTU	Dec. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) purchaser	Dec. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) $ / bbl	Dec. 31, 2020 USD ($) $ / MMBTU	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($)	Dec. 31, 2019 purchaser	Dec. 31, 2019	Dec. 31, 2019 $ / bbl	Dec. 31, 2019 $ / MMBTU	Dec. 31, 2019 shares
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Billing date	30 days
Outstanding days of account receivable	60 days
Allowance for doubtful accounts	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0
Number of purchasers | purchaser			3					2						2
Capitalized general and administrative costs		38,400,000					30,000,000						$ 31,100,000
Capitalized interest expense		4,800,000					5,000,000						7,600,000
Depletion		(310,100,000)					(334,800,000)						(330,700,000)
Previous period used for price calculation	12 months
Present value discounted percent of future net revenues of proved oil and natural gas reserves				10.00%
Average oil and natural gas prices					63.04	3.60				36.04	1.99					52.19	2.58
Impairment charge of net capitalized costs		0					684,743,000						0
Stock-based compensation (non-cash) expense		9,039,000					13,625,000						18,505,000
Common stock and restricted stock unit expense		900,000					1,000,000						1,400,000
Compensation expense, liability-based awards		20,400,000					4,000,000						3,200,000
Minimum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable due period	30 days
Contract term after production	1 month
Maximum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable due period	60 days
Contract term after production	2 months
Plains Marketing, L.P. | Customer Concentration Risk | Sales Revenue, Goods, Net
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Concentration risk, percentage				29.00%					57.00%						53.00%
Plains Marketing, L.P. | Customer Concentration Risk | Accounts Receivable
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Concentration risk, percentage				39.00%
BP America Production Company | Customer Concentration Risk | Sales Revenue, Goods, Net
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Concentration risk, percentage									10.00%						14.00%
BP America Production Company | Customer Concentration Risk | Accounts Receivable
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Concentration risk, percentage															31.00%
Exxon Mobil Corporate | Customer Concentration Risk | Sales Revenue, Goods, Net
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Concentration risk, percentage				33.00%					8.00%
Exxon Mobil Corporate | Customer Concentration Risk | Accounts Receivable
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Concentration risk, percentage									35.00%
Two Significant Customers | Customer Concentration Risk | Sales Revenue, Goods, Net
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Concentration risk, percentage									65.00%						67.00%
Three Significant Customers | Customer Concentration Risk | Sales Revenue, Goods, Net
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Concentration risk, percentage				72.00%
Machinery and Equipment
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Capitalized general and administrative costs		$ 1,300,000					1,800,000						1,800,000
Capitalized interest expense							$ 500,000						$ 900,000
Useful life using the straight-line	30 years
Machinery and Equipment | Minimum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Useful life	5 years
Machinery and Equipment | Maximum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Useful life	30 years
Employee Stock Options
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Antidilutive options excluded from calculation (in shares) | shares												2,500,000						2,600,000
Restricted Stock
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Antidilutive options excluded from calculation (in shares) | shares												700,000