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Stockholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Oct. 31, 2018
May 24, 2018
Share-based Compensation Arrangement by Share-based Payment Award          
Number of shares of common stock subject to awards         1,500,000
Shares available for grant 1,361,748 1,570,274 737,689    
Amount of compensation exchanged for deferred stock units     $ 6,900    
Weighted average diluted shares outstanding excludes shares of common stock subject to stock options 122,775 94,747 104,073    
Number of shares authorized to be repurchased (in shares)       150,000,000.0  
Stock repurchase program, period in force 3 years        
Stock repurchased during period (in shares) 402,570 402,570      
Weighted average price (in usd per share) $ 71.28        
Stock repurchased during period $ 28,700 $ 28,695      
Deferred and Restricted Stock Unit          
Share-based Compensation Arrangement by Share-based Payment Award          
Unrecognized compensation costs $ 18,300        
Unrecognized compensation costs, weighted-average recognition period 1 year 4 months 24 days        
Stock Awards          
Share-based Compensation Arrangement by Share-based Payment Award          
Unrecognized compensation costs $ 2,900        
Unrecognized compensation costs, weighted-average recognition period 10 months 24 days