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Share Repurchases Statement - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 6 Months Ended
Jun. 30, 2017
Jul. 13, 2017
Equity, Class of Treasury Stock [Line Items]    
Treasury Stock, Shares, Acquired 3,575  
Treasury Stock, Value, Acquired, Cost Method $ (231,674)  
Treasury Stock Acquired, Average Cost Per Share $ 64.81  
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 445,430  
Subsequent Event [Member]    
Equity, Class of Treasury Stock [Line Items]    
Stock Repurchase Program, Authorized Amount   $ 1,240,748
Stock Repurchase Program, Remaining Authorized Repurchase Amount   $ 259,252