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Shareholders' Equity (Narrative) (Details) - USD ($)
$ in Thousands, shares in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Class of Stock [Line Items]    
Dividends $ 26,051 $ 28,838
Payments for repurchase of common stock $ 59,491 $ 105,522
Share repurchase plan    
Class of Stock [Line Items]    
Share repurchases (shares) 1.7 4.7
Payments for repurchase of common stock $ 52,500 $ 100,000
Remaining value of stock repurchase programs authorization 542,000  
Shares withheld to pay taxes    
Class of Stock [Line Items]    
Payments for repurchase of common stock $ 7,000 $ 5,500