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STOCK COMPENSATION - VESTING PERIOD (Details)
9 Months Ended
Sep. 30, 2018
plan
shares
Stock Based Compensation  
Number of share based compensation plans | plan 3
Stock Option Plans | Stock options  
Stock Based Compensation  
Life of awards 10 years
1993 Non-Employee Directors Stock Ownership Incentive Plan | Stock options  
Stock Based Compensation  
Number of shares authorized for issuance | shares 20,000