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Stock Based Compensation, Stock Options Outstanding By Exercise Price Range (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
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  
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) 1 year 10 months 22 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) 1 year 10 months 22 days  
Stock Options [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value $ 68,593 $ 137,000