Basis of Presentation (Narrative) (Details)	3 Months Ended		30 Months Ended
	Mar. 31, 2023 USD ($) shares investment $ / shares	Mar. 31, 2022 USD ($) shares	Mar. 31, 2023 shares investment $ / shares	Apr. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Weighted average common shares outstanding – basic (in shares)	51,503,000	51,602,000
Weighted average common shares outstanding – diluted (in shares)	53,763,000	51,602,000
Dilutive impact of warrants (in shares)	1,899,000	0
Number of warrants outstanding (in shares)	2,900,000		2,900,000
Number of warrants exercised (in shares)			1,500,000
Write-down of oil and natural gas properties | $	$ 0	$ 0
Number of investment | investment	2		2
Equity investment | $	$ 7,108,000	$ 0
Aqualung Carbon Capture AS | Investment Commitment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity investment | $	2,000,000
ION Clean Energy, Inc. | Investment Commitment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity investment | $	$ 5,000,000
Project Development Company of Planned Louisiana Blue Hydrogen Ammonia Project | Investment Commitment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Committed to invest, on certain milestone achieved | $					$ 20,000,000
Project Development Company of Planned Louisiana Blue Hydrogen Ammonia Project | Investment Commitment | Subsequent Event
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Committed to invest, on certain milestone achieved | $				$ 10,000,000
Series A Warrants
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of warrants outstanding (in shares)	1,800,000		1,800,000
Exercise price of warrants (in dollars per share) | $ / shares	$ 32.59		$ 32.59
Number of warrants exercised (in shares)	900,000		900,000
Series B Warrants
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of warrants outstanding (in shares)	1,100,000		1,100,000
Exercise price of warrants (in dollars per share) | $ / shares	$ 35.41		$ 35.41
Number of warrants exercised (in shares)	1,800,000		1,800,000
Net Income Scenario
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Weighted average common shares outstanding – diluted (in shares)		55,000,000
Dilutive impact of warrants (in shares)		2,800,000
Net Income Scenario | Restricted stock units
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Dilutive impact of restricted stock units (in shares)		600,000
Performance-based and restricted stock units
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Weighted average common shares outstanding – basic (in shares)	1,775,182