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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)

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