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Stock-Based Compensation Schedule of Unvested Restricted Stock Units Activity (Details) - RSUs - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Summary of Expected to Vest RSUs [Line Items]    
Unvested RSUs, shares 1,612,424 1,873,737
RSUs granted during the period 743,926  
RSUs vested, shares (858,470)  
RSUs forfeited/canceled, shares (146,769)  
RSUs expected to vest, shares 1,555,391  
Unvested RSUs, weighted average grant date fair value $ 29.58 $ 27.58
RSUs granted, weighted average grant date fair value 31.77  
RSUs vested, weighted average grant date fair value 26.85  
RSUs forfeited/canceled, weighted average grant date fair value 31.15  
RSUs expected to vest, weighted average grant date fair value $ 29.56  
ShareBasedCompensationArrangementByShareBasedPaymentAwardRSUsAndRestrictedStockExpectedToVestOutstandingWeightedAverageRemainingContractualTerm 2 years 8 months 9 days  
RSUs expected to vest, aggregate intrinsic value $ 55,979