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Stock Option Plan Narrative Data (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Mar. 16, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock options outstanding 8,500 11,000 8,500 11,000 13,500  
Intrinsic value at grant date of stock options     $ 0      
Requisite service period     1 year      
Vesting period     1 year   1 year  
Contractual term     7 years      
Stock based compensation expense     $ 66 $ 35 $ 20  
Unrecognized compensation cost related to unvested stock option grants to be recognized in 2015 $ 0   $ 0      
2014 Equity Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares authorized for option grants 50,000   50,000      
Stock options outstanding 4,500 6,000 4,500 6,000    
Stock options exercisable 4,500   4,500      
Stock options granted     0 0 6,000  
2008 ISO Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock options outstanding 4,000 5,000 4,000 5,000    
Stock options exercisable 4,000   4,000      
Restricted Stock Units (RSUs) [Member] | 2014 Equity Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
RSUs granted   5,445        
Grant date fair value   $ 27.91   $ 27.91   $ 29.10
Unrecognized compensation expense, unvested RSUs $ 86   $ 86      
Contingent RSUs provisionally granted           4,456
Unrecognized compensation expense, contingent unvested RSUs $ 130   130      
Stock Options [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock based compensation expense     $ 0 $ 35 $ 20  
Time-Based [Member] | Restricted Stock Units (RSUs) [Member] | 2014 Equity Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period 3 years          
Performance-Based [Member] | Restricted Stock Units (RSUs) [Member] | 2014 Equity Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period 2 years