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Shareholders' Equity (Narrative) (Details) - USD ($)
$ in Thousands, shares in Millions
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Class of Stock [Line Items]    
Dividends $ 83,685 $ 93,127
Payments for repurchase of common stock $ 665,812 $ 350,846
Share repurchase plan    
Class of Stock [Line Items]    
Share repurchases (shares) 27.8 17.7
Payments for repurchase of common stock $ 659,800 $ 347,700
Remaining value of stock repurchase programs authorization 345,000  
Shares withheld to pay taxes    
Class of Stock [Line Items]    
Payments for repurchase of common stock $ 6,000 $ 3,200