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v3.20.4

Income Taxes - Net Deferred Tax Assets/Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred Tax Assets: |  |
Net Operating Loss- Federal | $ 215,936 | $ 202,913
Net Operating Loss - State | 129,641 | 130,430
Foreign Tax Credit | 43,194 | 43,194
Operating Lease Right-of-Use Assets | 28,085 | 47,849
Gas Well Closing | 24,251 | 17,888
Salary Retirement | 11,478 | 9,236
Equity Compensation | 6,639 | 9,308
Alternative Minimum Tax | 0 | 51,241
Interest Limitation | 0 | 25,734
Other | 9,416 | 10,030
Total Deferred Tax Assets | 468,640 | 547,823
Valuation Allowance | (123,098) | (125,054)
Net Deferred Tax Assets | 345,542 | 422,769
Deferred Tax Liabilities: |  |
Property, Plant and Equipment | (649,917) | (593,401)
Investment in Partnership | (85,882) | (145,424)
Gas Derivatives | (26,882) | (105,721)
Operating Lease Liabilities | (28,287) | (46,640)
Discount on Convertible Notes | (18,097) | 0
Advance Gas Royalties | (2,519) | (3,337)
Other | (211) | (4,354)
Total Deferred Tax Liabilities | (811,795) | (898,877)
Net Deferred Tax Liability | $ (466,253) | $ (476,108)

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