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Stock Based Compensation, Stock Options Outstanding By Exercise Price Range (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Outstanding stock options, number (in shares) | 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 4 months 18 days
Exercisable stock options, number (in shares) | 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 4 months 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) | 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) 9 months 27 days
Exercisable stock options, number (in shares) | 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) 9 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) | 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 10 months 22 days
Exercisable stock options, number (in shares) | 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 10 months 22 days
Stock Options [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Aggregate intrinsic value of options exercisable | $ $ 137