Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Deferred Tax Provision Benefit [Line Items]          
Total deferred tax provision (benefit)     $ 24,138 $ (10,280)  
Provision for income taxes $ 64,057 $ 57,475 118,063 109,572  
Gross Unrecognized Tax Benefits Reconcilement [Line Items]          
Unrecognized Tax Benefits, Beginning Balance     1,200    
Unrecognized Tax Benefits, Ending Balance 0 2,800 0 2,800  
Provision (benefit) for income taxes reconcilement          
Provision for income taxes 64,057 57,475 118,063 109,572  
Income Taxes Textuals [Abstract]          
Total interest accrued on the unrecognized tax benefits 0 $ 100 0 $ 100 $ 100
Reasonably possible change in unrecognized tax benefits in the next 12 months $ 0   $ 0