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STOCK-BASED COMPENSATION (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Shares available for grant   678,951    
Closing stock price of common stock   $ 35.02    
Performance Shares [Member]        
Unrecognized compensation cost   $ 1,700    
Reversal of previously recorded amounts $ 592      
Employee Stock Option [Member]        
Option term   10 years    
Vesting term   5 years    
Unrecognized compensation cost   $ 43,600    
Weighted average period, unrecognized compensation expected to be recognized (in years)   6 months 14 days    
Total compensation cost   $ 6 $ 56 $ 219
Restricted stock [Member]        
Unrecognized compensation cost   $ 737    
Weighted average period, unrecognized compensation expected to be recognized (in years)   1 year 2 months 12 days    
Total compensation cost   $ 3,500 $ 2,800 $ 1,500
Restricted stock [Member] | Share-based Compensation Award, Tranche Two [Member]        
Vesting term   5 years    
Restricted stock [Member] | Share-based Compensation Award, Tranche One [Member]        
Vesting term   3 years