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STOCK-BASED COMPENSATION (Details) (USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Restricted stock units
Mar. 31, 2014
Restricted stock units
2013 Plan
Dec. 31, 2013
Restricted stock units
2013 Plan
Stock-based compensation          
Shares granted during the period with approved performance criteria for 2013         637,800
Weighted average per unit grant date fair value (in dollars per share)         $ 10.53
Stock-based compensation expense recognized $ (1,507,000) $ 1,338,000   $ 500,000  
Compensation cost related to unvested granted awards not yet recognized       7,800,000  
Compensation cost related to RSU for which performance criteria for 2014 and following years are not set       $ 7,300,000  
Weighted average period of recognition of unrecognized compensation cost related to nonvested awards     3 years    
Granted (in shares)     700,000