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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 |

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