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Income Taxes - Deferred Tax Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Deferred tax liabilities    
Investments(1) $ 301,447 [1] $ 334,331 [1]
Property, plant and equipment 180,140 198,424
Derivative contracts 0 24,819
Total deferred tax liabilities 481,587 557,574
Deferred tax assets    
Derivative contracts 3,692 0
Allowance for doubtful accounts 20,358 17,713
Net operating loss carryforwards 973,675 859,328
Litigation settlement 355 7,200
Compensation and benefits 24,895 13,935
Alternative minimum tax credits and other carryforwards 46,624 42,242
Asset retirement obligations 147,626 172,229
Under-delivery obligation 15,012 0
Other 2,801 2,193
Total deferred tax assets 1,235,038 1,114,840
Valuation allowance (753,451) (557,266)
Net deferred tax liability $ 0 $ 0
[1] Includes the Company’s deferred tax liability resulting from its investment in the Royalty Trusts. See Note 4 for further discussion of the Royalty Trusts.