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Income Taxes - Deferred Tax Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Deferred tax liabilities    
Investments $ 334,331 [1] $ 233,819 [1]
Property, plant and equipment 198,424 0
Derivative contracts 24,819 0
Total deferred tax liabilities 557,574 233,819
Deferred tax assets    
Property, plant and equipment 0 289,148
Derivative contracts 0 39,268
Allowance for doubtful accounts 17,713 11,725
Net operating loss carryforwards 859,328 556,768
Litigation Settlement 7,200 0
Compensation and benefits 13,935 14,053
Alternative minimum tax credits and other carryforwards 42,242 39,979
Asset retirement obligations 172,229 45,762
Other 2,193 2,721
Total deferred tax assets 1,114,840 999,424
Valuation allowance (557,266) (765,605)
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.