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STOCK-BASED COMPENSATION - Summary of Additional Information Concerning Restricted Stock Units (Details) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Restricted Stock Units Activity      
Vested (in shares) (235,334) (315,117)  
Restricted Stock Units [Member]      
Restricted Stock Units Activity      
Unvested beginning balance (in shares) 562,426    
Granted (in shares) 504,608    
Vested (in shares) (341,354)    
Dividends reinvested (in shares) 37,353    
Cancelled (in shares) (30,277)    
Unvested ending balance (in shares) 732,756 562,426  
Weighted Average Grant Date Fair Value Per Unit      
Unvested beginning balance (in dollars per share) $ 23.26    
Granted (in dollars per share) 21.11 $ 25.88 $ 18.52
Vested (in dollars per share) 24.78    
Dividends reinvested (in dollars per share) 23.19    
Cancelled (in dollars per share) 18.66    
Unvested ending balance (in dollars per share) $ 21.37 $ 23.26