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STOCK BASED COMPENSATION PLANS - Nonvested Shares Outstanding (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Restricted Stock        
Number of Shares Nonvested Other than Options [Roll Forward]        
Nonvested/Outstanding at December 31, 2015     1,334,369  
Granted (in shares)     960,532  
Vested (in shares)     (274,842)  
Forfeited (in shares)     (48,467)  
Nonvested/Outstanding at June 30, 2016 1,971,592   1,971,592  
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]        
Nonvested/Outstanding December 31, 2015     601,186  
Granted (in shares) 0 0 380,949 670,256
Exercised (in shares)     0  
Forfeited (in shares)     0  
Expired (in shares)     0  
Nonvested/Outstanding June 30, 2016 982,135   982,135  
Exercisable at June 30, 2016 230,936   230,936  
LP Units        
Number of Shares Nonvested Other than Options [Roll Forward]        
Nonvested/Outstanding at December 31, 2015     504  
Granted (in shares)     0  
Vested (in shares)     (504)  
Forfeited (in shares)     0  
Nonvested/Outstanding at June 30, 2016 0   0