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EARNINGS PER SHARE AND UNIT - Additional Information (Details)
12 Months Ended
Dec. 31, 2018
shares
Dec. 31, 2017
$ / shares
shares
Dec. 31, 2016
$ / shares
shares
Dec. 31, 2015
shares
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Options outstanding (in shares) 4,750,549 2,603,664 2,472,284 2,289,139
Conversion ration of common shares 1      
Stock options using the treasury stock method        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Stock options using treasure stock method and restricted stock awards (in shares) 0 167,933 256,917  
Restricted share awards        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Stock options using treasure stock method and restricted stock awards (in shares) 188,329 167,100 114,354  
Unvested restricted shares outstanding (in shares) 162,577      
Stock options using the treasury stock method        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Exercise price of options, lower range limit (in dollars per share) | $ / shares   $ 22.83    
Exercise price of options, upper range limit (in dollars per share) | $ / shares     $ 28.36