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Share-Based Compensation and Employee Ownership Plans SARs (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 05, 2016
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stockholders' Equity Note, Stock Split, Conversion Ratio 0.25      
Aggregate Intrinsic Value        
Closing stock price, in dollars per share   $ 13.65 $ 15.50  
Stock Appreciation Rights        
Aggregate Intrinsic Value        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercisable, Weighted remaining contractual term   0 years    
Equity Plans        
Aggregate Intrinsic Value        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value | $ [1]   $ 0 $ 0  
Equity Plans | Stock Appreciation Rights        
Shares Subject to Option        
Balance outstanding, beginning of period, shares | shares   100,000 100,000  
Granted, shares | shares   0 0  
Acquired, shares | shares   (25,000) 0  
Expired, shares | shares   0 0  
Balance outstanding, end of period, shares | shares   75,000 100,000 100,000
Balance exercisable, shares | shares   0    
Weighted Average Exercise Price/Share        
Balance outstanding, beginning of period, in dollars per share   $ 11.60 $ 11.60  
Granted, in dollars per share   0.00 0.00  
Acquired, in dollars per share   11.60 0.00  
Expired, in dollars per share   0.00 0.00  
Balance outstanding, end of period, in dollars per share   $ 11.60 $ 11.60 $ 11.60
Weighted Average Remaining Term Outstanding   2 months 16 days 1 year 2 months 16 days 2 years 2 months 16 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding | $ [2]   $ 173 $ 435  
Aggregate Intrinsic Value        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value | $ [2]       $ 558
Unrecognized compensation expense | $     $ 100  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercisable, Weighted Average Grant Date Fair Value   $ 0.00    
[1] Based on the Company's closing stock price of $13.65 on December 31, 2017 and $15.50 on December 31, 2016.
[2] Based on the Company's closing stock price of $13.65 on December 31, 2017 and $15.50 on December 31, 2016.