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STOCK-BASED COMPENSATION, STOCK OPTIONS, BY EXERCISE PRICE (Details)
12 Months Ended
Dec. 31, 2018
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
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 2 years 1 month 21 days
Exercisable stock options, number (in shares) | shares 13,278
Exercisable stock option, weighted average exercise price (in dollars per shares) $ 11.98
Exercisable stock options, weighted average remaining contractual life 2 years 1 month 21 days
$9.00 - 10.99  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price range, lower range limit (in dollars per share) $ 9.00
Exercise price range, upper range limit (in dollars per share) 10.99
$11.00 - 12.99  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price range, lower range limit (in dollars per share) 11.00
Exercise price range, upper range limit (in dollars 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 2 years 1 month 21 days
Exercisable stock options, number (in shares) | shares 13,278
Exercisable stock option, weighted average exercise price (in dollars per shares) $ 11.98
Exercisable stock options, weighted average remaining contractual life 2 years 1 month 21 days
$17.00 - 18.99  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price range, lower range limit (in dollars per share) $ 17.00
Exercise price range, upper range limit (in dollars per share) $ 18.99