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Shareholders' Equity (Narrative) (Details) - USD ($)
$ in Thousands, shares in Millions
1 Months Ended 9 Months Ended
Jul. 31, 2016
Sep. 30, 2016
Sep. 30, 2015
Class of Stock [Line Items]      
Dividends   $ 93,127 $ 86,296
Payments for repurchase of common stock   $ 350,846 $ 442,738
Share repurchase plan      
Class of Stock [Line Items]      
Share repurchases (shares)   17.7 21.2
Payments for repurchase of common stock   $ 347,700 $ 433,700
Increase in share repurchase authorization $ 1,000,000    
Remaining value of stock repurchase programs authorization   1,300,000  
Shares withheld to pay taxes      
Class of Stock [Line Items]      
Payments for repurchase of common stock   $ 3,200 $ 9,000