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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Equity, Class of Treasury Stock [Line Items]      
Stock repurchased during period (shares) 1,427,000 1,305,000  
Dollar Amount Purchased in 2020 $ 106,970 $ 114,000  
Stock repurchase program, average cost per share (in dollars per share) $ 74.96 $ 87.37  
Dollar Amount Authorized $ 100,000    
Remaining Dollar Amount Authorized For Future Purchases 21,827    
Payments of dividends $ 44,752 $ 43,952 $ 40,853
43397      
Equity, Class of Treasury Stock [Line Items]      
Stock repurchased during period (shares) 344,000    
Dollar Amount Purchased in 2020 $ 28,797    
Remaining Dollar Amount Authorized For Future Purchases $ 0    
43858      
Equity, Class of Treasury Stock [Line Items]      
Stock repurchased during period (shares) 1,083,000    
Dollar Amount Purchased in 2020 $ 78,173    
Remaining Dollar Amount Authorized For Future Purchases $ 21,827