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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Equity, Class of Treasury Stock [Line Items]      
Stock repurchased during period (shares) 1,305,000 3,343,000  
Dollar Amount Purchased in 2019 $ 113,963 $ 274,500  
Stock repurchase program, average cost per share (in dollars per share) $ 87.37 $ 82.12  
Dollar Amount Authorized $ 100,000    
Remaining Dollar Amount Authorized For Future Purchases 28,797    
Payments of dividends $ 43,952 $ 40,853 $ 36,836
July 25, 2018      
Equity, Class of Treasury Stock [Line Items]      
Stock repurchased during period (shares) 496,000    
Dollar Amount Purchased in 2019 $ 42,760    
Remaining Dollar Amount Authorized For Future Purchases $ 0    
October 24, 2018      
Equity, Class of Treasury Stock [Line Items]      
Stock repurchased during period (shares) 809,000    
Dollar Amount Purchased in 2019 $ 71,203    
Remaining Dollar Amount Authorized For Future Purchases $ 28,797