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Share Repurchase Program Share Repurchse Program (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended
Sep. 30, 2017
Jul. 28, 2017
Accelerated Share Repurchases [Line Items]    
Stock Repurchase Program, Authorized Amount $ 194,803  
Shares Paid for Tax Withholding for Share Based Compensation 63,211,000  
Accelerated Share Repurchases, Final Price Paid Per Share $ 37.72  
Stock Repurchased During Period, Shares 1,898,249  
Stock Repurchased During Period, Value $ 70,841  
Stock Repurchase Program, Remaining Authorized Repurchase Amount   $ 200,000
Treasury Stock Acquired, Average Cost Per Share $ 37.32  
Payments Related to Tax Withholding for Share-based Compensation $ 2,384