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Shareholders' Equity (Narrative) (Details) - USD ($)
$ in Thousands, shares in Millions
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Class of Stock [Line Items]    
Dividends $ 56,941 $ 62,747
Payments for repurchase of common stock $ 405,819 $ 100,806
Share repurchase plan    
Class of Stock [Line Items]    
Share repurchases (shares) 17.5 5.6
Payments for repurchase of common stock $ 399,900 $ 97,700
Remaining value of stock repurchase programs authorization 604,900  
Shares withheld to pay taxes    
Class of Stock [Line Items]    
Payments for repurchase of common stock $ 5,900 $ 3,100