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Stockholders' Equity (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended
Apr. 15, 2016
Apr. 10, 2015
Feb. 29, 2016
Feb. 28, 2015
Mar. 31, 2016
Mar. 31, 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         242,174 218,323
Cash dividend (in usd per share)   $ 2     $ 0.3  
Special dividend, stock per share or unit   $ 2.00        
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    
Subsequent Event            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Cash dividend (in usd per share) $ 0.3          
Payments of dividends $ 7,300,000