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Stockholders' Equity (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 17, 2016
Apr. 15, 2016
Apr. 10, 2015
Feb. 29, 2016
Feb. 28, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Weighted average diluted shares outstanding excludes shares of common stock subject to stock options           244,219 313,944 243,197 308,634
Cash dividend (in usd per share) $ 0.30 $ 0.3 $ 2         $ 0.60  
Payments of dividends $ 7,400,000 $ 7,300,000           $ 14,707,000 $ 48,227,000
Special dividend, stock per share or unit     $ 2.00            
Dividend equivalents on stock-based awards $ 300,000 $ 300,000              
Reduction in exercise price for all outstanding stock options     $ 2.00            
Deferred stock units issued to executive officers       4,784 36,579        
Deferred stock units issued to executive officers, aggregate fair value       $ 300,000 $ 2,000,000        
Common Stock                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Payments of dividends     $ 48,200,000            
Deferred Stock Units, Restricted Stock and Stock Awards                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Dividend equivalents on stock-based awards     $ 1,800,000            
Weighted Average                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Deferred stock units issued to executive officers, exercise price       $ 55.22 $ 55.95