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Share Repurchase Program Share Repurchse Program (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended
Jun. 30, 2017
Jul. 28, 2017
Feb. 22, 2016
Accelerated Share Repurchases [Line Items]      
Stock Repurchase Program, Authorized Amount $ 55,490    
Shares Paid for Tax Withholding for Share Based Compensation 55,085,000    
Accelerated Share Repurchases, Final Price Paid Per Share $ 37.34    
Stock Repurchased During Period, Shares 1,677,813    
Stock Repurchased During Period, Value $ 61,884    
Stock Repurchase Program, Remaining Authorized Repurchase Amount     $ 136,000
Treasury Stock Acquired, Average Cost Per Share $ 36.88    
Payments Related to Tax Withholding for Share-based Compensation $ 2,057    
Subsequent Event [Member]      
Accelerated Share Repurchases [Line Items]      
Stock Repurchase Program, Remaining Authorized Repurchase Amount   $ 200