Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

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Income Taxes (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Deferred Tax Provision Benefit [Line Items]        
Total deferred tax provision (benefit)     $ 54,008,000 $ 151,449,000
Provision for income taxes 62,132,000 28,291,000 166,700,000 129,754,000
Gross Unrecognized Tax Benefits Reconcilement [Line Items]        
Unrecognized Tax Benefits, Ending Balance 700,000   700,000  
Provision (benefit) for income taxes reconcilement        
Provision for income taxes 62,132,000 28,291,000 166,700,000 129,754,000
Income Taxes Textuals [Abstract]        
Total interest accrued on the unrecognized tax benefits $ 100,000   $ 100,000