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BENEFIT PLANS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
BENEFIT PLANS      
Minimum percentage of annual eligible compensation by the participants 1.00%    
Maximum percentage of annual eligible compensation by the participants 75.00%    
401 (k) plan      
Percentage of employers matching contribution for participant contributions up to 1% 100.00%    
Percentage of additional employers matching contribution 75.00%    
Vesting period 2 years    
Normal and bonus contributions      
Employer matching contributions $ 1,517 $ 1,419 $ 1,576
Minimum      
401 (k) plan      
Percentage of participant contributions up to which employer matches additional 75% contribution 2.00%    
Maximum      
401 (k) plan      
Percentage of participant contributions up to which employer matches 100% contribution 1.00%    
Percentage of participant contributions up to which employer matches additional 75% contribution 5.00%