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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