Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Interim) (Details)

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Income Taxes (Interim) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Income taxes      
Unrecognized tax benefits that would impact effective tax rate, if recognized $ 1,884    
Reasonably possible decrease in liability for unrecognized tax benefits in the next twelve months 1,676    
Accrued interest and penalties on unrecognized tax benefits 452   $ 594
Excess tax benefits from stock-based compensation expense 18,010 $ 5,086  
Other non-current liabilities      
Income taxes      
Liability for unrecognized tax benefits 2,000   $ 2,092
Prepaid expenses and other current assets      
Income taxes      
Excess tax benefits from stock-based compensation expense $ 18,010