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Stockholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Feb. 01, 2017
May 22, 2014
Jan. 06, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award            
Aggregate intrinsic value, option shares outstanding       $ 2.4    
Reduction in outstanding options exercise price     $ 2.00      
Number of shares available for issuance following increase   1,678,632        
Shares available for grant       1,049,752 1,305,440 1,389,506
Amount of compensation exchanged for deferred stock units       $ 0.3 $ 2.0 $ 2.0
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       184,277 255,547 293,860
Weighted average remaining term, option shares outstanding       10 months 22 days    
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    
Deferred Stock Unit            
Share-based Compensation Arrangement by Share-based Payment Award            
Unrecognized compensation costs, weighted-average recognition period       1 year 6 months    
Unrecognized compensation costs       $ 14.4    
Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award            
Unrecognized compensation costs, weighted-average recognition period       5 months    
Unrecognized compensation costs       $ 0.5    
Stock Awards            
Share-based Compensation Arrangement by Share-based Payment Award            
Unrecognized compensation costs, weighted-average recognition period       1 year 5 months    
Unrecognized compensation costs       $ 7.6    
Stock awards, performance period       3 years    
Subsequent Event            
Share-based Compensation Arrangement by Share-based Payment Award            
Deferred stock units, value $ 6.9