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Share-Based Compensation and Employee Ownership Plans SARs (Details)
$ / shares in Units, $ in Thousands
9 Months Ended 12 Months Ended
Dec. 05, 2016
Sep. 30, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
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   $ 17.80 $ 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  
Equity Plans | Stock Appreciation Rights      
Shares Subject to Option      
Balance outstanding, beginning of period, shares | shares   100,000  
Granted, shares | shares   0  
Acquired, shares | shares   (25,000)  
Expired, shares | shares   0  
Balance outstanding, end of period, shares | shares   75,000 100,000
Balance exercisable, shares | shares   0  
Weighted Average Exercise Price/Share      
Balance outstanding, beginning of period, in dollars per share   $ 11.60  
Granted, in dollars per share   0.00  
Acquired, in dollars per share   11.60  
Expired, in dollars per share   0.00  
Balance outstanding, end of period, in dollars per share   $ 11.60 $ 11.60
Weighted Average Remaining Term Outstanding   5 months 16 days 1 year 2 months 16 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding | $ [2]   $ 477 $ 435
Aggregate Intrinsic Value      
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 $17.80 on September 30, 2017 and $15.50 on December 31, 2016.
[2] Based on the Company's closing stock price of $17.80 on September 30, 2017 and $15.50 on December 31, 2016.