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Share Repurchases Share Repurchase Program (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jul. 28, 2017
Equity, Class of Treasury Stock [Line Items]          
Factoring Fee   0.20%      
Debt Instrument, Basis Spread on Variable Rate 0.50%        
Shares Paid for Tax Withholding for Share Based Compensation   346,820.00      
Payments Related to Tax Withholding for Share-based Compensation   $ 14,629      
Stock Repurchased During Period, Shares   2,601,000 (2,437,000) 3,704,000  
Treasury Stock Acquired, Average Cost Per Share   $ 42.18      
Stock Repurchased During Period, Value   $ 99,412 $ 86,005 $ 135,637  
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 180,861 $ 180,861     $ 200,000
London Interbank Offered Rate (LIBOR) [Member]          
Equity, Class of Treasury Stock [Line Items]          
Debt Instrument, Basis Spread on Variable Rate 2.50%        
Common Stock [Member]          
Equity, Class of Treasury Stock [Line Items]          
Stock Repurchased During Period, Shares   (2,254,000)      
Treasury Stock Acquired, Average Cost Per Share   $ 37.62      
Stock Repurchased During Period, Value   $ 84,783      
Private Label [Member]          
Equity, Class of Treasury Stock [Line Items]          
Factoring Fee   0.14%