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EMPLOYEE BENEFIT PLANS (Details) (USD $)
12 Months Ended
Dec. 31, 2012
item
Dec. 31, 2011
Dec. 31, 2010
EMPLOYEE BENEFIT PLANS      
Additional benefits accrued to participants under the plan $ 0    
Number of new employees eligible under the plan 0    
Pension expenses $ 75,500 $ 42,000 $ 31,000
Employee Benefit Plans      
Minimum average total rate of return above the rate of inflation (as a percent) 4.00%    
Equities
     
Employee Benefit Plans      
Maximum equity exposure as a percentage of total portfolio value 75.00%    
Actual rate of return assumed (as a percent) 10.00%    
Fixed income
     
Employee Benefit Plans      
Actual rate of return assumed (as a percent) 4.00%