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Stock Based Compensation, Stock Options Outstanding By Exercise Price Range (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Outstanding stock options, number (in shares) 17,634  
Outstanding stock option, weighted average exercise price (in dollars per share) $ 11.25  
Outstanding stock option, weighted average remaining contractual life (years) 2 years 1 month 18 days  
Exercisable stock options, number (in shares) 17,634  
Exercisable stock option, weighted average exercise price (in dollars per share) $ 11.25  
Exercisable stock options, weighted average remaining contractual life (years) 2 years 1 month 18 days  
Exercise Price Range, 9.00 to 10.99 [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Exercise price range, lower range limit (usd per share) $ 9.00  
Exercise price range, upper range limit (usd per share) $ 10.99  
Outstanding stock options, number (in shares) 4,356  
Outstanding stock option, weighted average exercise price (in dollars per share) $ 9.00  
Outstanding stock option, weighted average remaining contractual life (years) 6 months 27 days  
Exercisable stock options, number (in shares) 4,356  
Exercisable stock option, weighted average exercise price (in dollars per share) $ 9.00  
Exercisable stock options, weighted average remaining contractual life (years) 6 months 27 days  
Exercise Price Range 11.00 to 12.99 [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Exercise price range, lower range limit (usd per share) $ 11.00  
Exercise price range, upper range limit (usd per share) $ 12.99  
Outstanding stock options, number (in shares) 13,278  
Outstanding stock option, weighted average exercise price (in dollars per share) $ 11.98  
Outstanding stock option, weighted average remaining contractual life (years) 2 years 7 months 23 days  
Exercisable stock options, number (in shares) 13,278  
Exercisable stock option, weighted average exercise price (in dollars per share) $ 11.98  
Exercisable stock options, weighted average remaining contractual life (years) 2 years 7 months 23 days  
Stock Options [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Aggregate intrinsic value of options exercisable $ 149 $ 174