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Shareholders' Equity (Details) - USD ($)
$ in Thousands, shares in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Class of Stock [Line Items]    
Dividends $ 30,831 $ 26,051
Payments for repurchase of common stock $ 35,353 $ 59,491
Share repurchase plan    
Class of Stock [Line Items]    
Share repurchases (shares) 0.9 1.7
Payments for repurchase of common stock $ 25,000 $ 52,500
Remaining value of stock repurchase programs authorization 274,900  
Shares withheld to pay taxes    
Class of Stock [Line Items]    
Payments for repurchase of common stock $ 10,400 $ 7,000