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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Deferred tax liabilities      
Investments $ 138,310 $ 272,902  
Property, plant and equipment 0 364,576  
Derivative contracts 30,989 113,735  
Long-term debt 10,017 0  
Total deferred tax liabilities 179,316 751,213  
Deferred tax assets      
Property, plant and equipment 807,275 0  
Allowance for doubtful accounts 18,702 19,086  
Net operating loss carryforwards 1,190,799 1,265,458  
Compensation and benefits 18,607 19,867  
Alternative minimum tax credits and other carryforwards 44,302 43,840  
Asset retirement obligations 38,314 21,946  
CO2 under-delivery shortfall penalty 40,654 27,674  
Other 4,305 2,934  
Total deferred tax assets 2,162,958 1,400,805  
Valuation allowance (1,983,642) (649,592) $ (753,500)
Net deferred tax liability $ 0 $ 0