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Stockholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Apr. 10, 2015
May. 22, 2014
Jan. 06, 2014
Jan. 06, 2014
Feb. 29, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award                
Dividends paid per share $ 2.00     $ 2.00        
Reduction in outstanding options exercise price     $ 2.00          
Number of shares available for issuance following increase   1,678,632            
Shares available for grant           1,305,440 1,389,506 246,368
Amount of compensation exchanged for deferred stock units           $ 2.0 $ 2.0 $ 0.1
Minimum percentage stock option exercise price must be equal to fair market value           100.00%    
Minimum holding period of common stock           6 months    
Weighted average diluted shares outstanding excludes shares of common stock subject to stock options           255,547 293,860 303,240
Maximum                
Share-based Compensation Arrangement by Share-based Payment Award                
Expiration period in years           10 years    
Deferred Stock Units, Restricted Stock and Stock Awards                
Share-based Compensation Arrangement by Share-based Payment Award                
Deferred stock units, per share       $ 2.00        
Value of stock issued during period       $ 1.8        
Stock Options                
Share-based Compensation Arrangement by Share-based Payment Award                
Expiration period of stock options           6 years    
Vesting period           5 years    
Unvested stock options, unrecognized compensation costs           $ 0.4    
Unrecognized compensation costs, weighted-average recognition period           10 months 8 days    
Deferred Stock Unit                
Share-based Compensation Arrangement by Share-based Payment Award                
Unrecognized compensation costs, weighted-average recognition period           1 year 11 months 5 days    
Unrecognized compensation costs           $ 12.7    
Restricted Stock                
Share-based Compensation Arrangement by Share-based Payment Award                
Unrecognized compensation costs, weighted-average recognition period           10 months    
Unrecognized compensation costs           $ 1.0    
Stock Awards                
Share-based Compensation Arrangement by Share-based Payment Award                
Unrecognized compensation costs, weighted-average recognition period           1 year 6 months    
Unrecognized compensation costs           $ 6.7    
Stock awards, performance period           3 years    
Common Stock                
Share-based Compensation Arrangement by Share-based Payment Award                
Payments of dividends $ 48.2     $ 46.7        
Subsequent Event                
Share-based Compensation Arrangement by Share-based Payment Award                
Deferred stock units, value         $ 0.3