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SHARE-BASED COMPENSATION (Details) (USD $)
3 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2014
2007 EIP
Mar. 31, 2013
2007 EIP
Mar. 31, 2014
2012 EIP
Mar. 31, 2014
Stock Options
Mar. 31, 2014
Stock Options
2007 EIP
Mar. 31, 2014
Stock Options
2012 EIP
Mar. 31, 2014
Stock Options
Minimum
Mar. 31, 2014
Stock Options
Maximum
Mar. 31, 2014
Restricted stock unit (RSU)
2007 EIP
Mar. 31, 2014
Restricted stock unit (RSU)
2012 EIP
Mar. 31, 2014
Restricted stock unit (RSU)
Minimum
Mar. 31, 2014
Restricted stock unit (RSU)
Maximum
SHARE-BASED COMPENSATION                        
Number of shares of common stock reserved for grants 691,051   1,200,000                  
Number of shares reserved         73,897 116,987     74,659 558,883    
Common stock issued under share-based compensation plan   213,070 192,193                  
Vesting term             1 year 5 years     1 year 5 years
Expiration term       10 years                
Summary of the stock option activity                        
Outstanding at the beginning of the period (in shares)       207,775                
Granted (in shares)       0                
Expired (in shares)       (16,891)                
Outstanding at the end of the period (in shares)       190,884                
Exercisable (in shares)       91,440                
Weighted Average Exercise Price                        
Outstanding at the beginning of the period (in dollars per share)       $ 26.22                
Expired (in dollars per share)       $ 101.25                
Outstanding at the end of the period (in dollars per share)       $ 19.58                
Exercisable (in dollars per share)       $ 35.62