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Income Taxes Net Deferred Tax Assets/Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred Tax Assets: |  |
Net Operating Loss- Federal | $ 51,241 | $ 102,482
Net Operating Loss - State | 202,913 | 124,341
Alternative Minimum Tax | 130,430 | 110,339
Foreign Tax Credit | 43,194 | 43,194
Interest Limitation | 25,734 | 32,147
Gas Well Closing | 9,308 | 13,096
Equity Compensation | 17,888 | 10,140
Salary Retirement | 9,236 | 9,434
Finance Lease | 1,209 | 1,624
Other | 10,030 | 13,714
Total Deferred Tax Assets | 501,183 | 460,511
Valuation Allowance | (125,054) | (94,455)
Net Deferred Tax Assets | 376,129 | 366,056
Deferred Tax Liabilities: |  |
Property, Plant and Equipment | (593,401) | (606,342)
Investment in Partnership | (145,424) | (125,253)
Gas Derivatives | (105,721) | (26,160)
Advance Gas Royalties | (3,337) | (3,384)
Other | (4,354) | (3,599)
Total Deferred Tax Liabilities | (852,237) | (764,738)
Net Deferred Tax Liability | $ 476,108 | $ 398,682

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