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Income Taxes - Net Deferred Tax Assets/Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred Tax Assets:    
Gas Derivatives $ 262,658 $ 0
Net Operating Loss- Federal 209,731 215,936
Net Operating Loss - State 128,592 129,641
Foreign Tax Credit 39,404 43,194
Federal Tax Credits 33,034 0
Gas Well Closing 25,682 24,251
Operating Lease Liabilities 14,322 28,085
Salary Retirement 11,504 11,478
Equity Compensation 5,838 6,639
Other 8,613 9,416
Total Deferred Tax Assets 739,378 468,640
Valuation Allowance (151,798) (123,098)
Net Deferred Tax Assets 587,580 345,542
Deferred Tax Liabilities:    
Property, Plant and Equipment (749,811) (649,917)
Investment in Partnership (133,287) (85,882)
Discount on Convertible Notes (15,864) (18,097)
Operating Lease Right-of-Use Assets (14,985) (28,287)
Advance Gas Royalties (1,842) (2,519)
Gas Derivatives 0 (26,882)
Other (392) (211)
Total Deferred Tax Liabilities (916,181) (811,795)
Net Deferred Tax Liability $ (328,601) $ (466,253)