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Stockholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
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 1,570,274 737,689 1,049,752    
Amount of compensation exchanged for deferred stock units   $ 6,900 $ 300    
Minimum percentage stock option exercise price must be equal to fair market value 100.00%        
Weighted average diluted shares outstanding excludes shares of common stock subject to stock options 94,747 104,073 184,277    
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        
Weighted average price (in usd per share) $ 71.28        
Stock repurchased during period $ 28,695        
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award          
Expiration period of stock options 6 years        
Deferred and Restricted Stock Unit          
Share-based Compensation Arrangement by Share-based Payment Award          
Unrecognized compensation costs $ 11,900        
Unrecognized compensation costs, weighted-average recognition period 1 year 2 months 12 days        
Stock Awards          
Share-based Compensation Arrangement by Share-based Payment Award          
Unrecognized compensation costs $ 700        
Unrecognized compensation costs, weighted-average recognition period 2 months 12 days        
Employees | Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting period 5 years