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Shareholders' Equity (Narrative) (Details) - USD ($)
$ in Thousands, shares in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Class of Stock [Line Items]    
Dividends $ 28,838 $ 31,459
Payments for repurchase of common stock $ 105,522 $ 52,745
Share repurchase plan    
Class of Stock [Line Items]    
Share repurchases (shares) 4.7 3.1
Payments for repurchase of common stock $ 100,000 $ 50,000
Remaining value of stock repurchase programs authorization 904,800  
Shares withheld to pay taxes    
Class of Stock [Line Items]    
Payments for repurchase of common stock $ 5,500 $ 2,700