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Income Taxes (Reconciliation To Effective Rate) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract      
IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 300,192 $ (111,165) $ 186,653
IncomeTaxReconciliationTaxCreditsOther (10,279) (7,517) (11,290)
IncomeTaxReconciliationTaxCreditsInvestment (66,895) (47,451) (55,497)
IncomeTaxReconciliationOtherAdjustments 616 70 244
Income Tax Expense (Benefit) 223,634 (166,063) [1] 119,506 [1]
State income taxes, net of federal benefit $ 0 $ 0 $ (604)
[1] “As previously reported” column represents balances reported in the Annual Report on Form 10-K for the year ended December 31, 2011, originally filed with the SEC on March 9, 2012. “As currently reported” column was included in the 8-K filed with the SEC on November 28, 2012.