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Shareholders' Equity (Narrative) (Details) - USD ($)
$ in Thousands, shares in Millions
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Class of Stock [Line Items]    
Dividends $ 77,673 $ 83,685
Payments for repurchase of common stock $ 179,439 $ 665,812
Share repurchase plan    
Class of Stock [Line Items]    
Share repurchases (shares) 5.8 27.8
Payments for repurchase of common stock $ 172,100 $ 659,800
Remaining value of stock repurchase programs authorization 422,400  
Shares withheld to pay taxes    
Class of Stock [Line Items]    
Payments for repurchase of common stock $ 7,400 $ 6,000