Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

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Income Taxes (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Deferred Tax Provision Benefit [Line Items]        
Total deferred tax provision (benefit)     $ (10,280,000) $ 77,234,000
Provision for income taxes 57,475,000 55,269,000 109,572,000 110,398,000
Gross Unrecognized Tax Benefits Reconcilement [Line Items]        
Unrecognized Tax Benefits, Ending Balance 0   0  
Provision (benefit) for income taxes reconcilement        
Provision for income taxes 57,475,000 55,269,000 109,572,000 110,398,000
Income Taxes Textuals [Abstract]        
Total interest accrued on the unrecognized tax benefits $ 0   $ 0