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SHAREHOLDERS' EQUITY AND PARTNERS' CAPITAL - At-the-Market Equity Program (Details) - USD ($) | 12 Months Ended | 94 Months Ended |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020 | Mar. 01, 2013
Class Of Stock [Line Items] |  |  |  |  |
Common stock offering, maximum aggregate price (up to) |  |  |  |  | $ 300,000,000
Commission to sales agent (as a percent) |  |  |  |  | 2.00%
Issuance of common stock and restricted common stock (shares) | 1,639,236 | 915,226 | 727,812 |  |
Common stock offering, maximum remaining aggregate price | $ 88,507,000 |  |  | $ 88,507,000 |
Common Stock |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Gross proceeds from issuance of common stock | 211,493,000 |  |  |  |
Net proceeds from issuance of common stock | $ 209,596,000 |  |  |  |
Issuance of common stock and restricted common stock (shares) |  |  |  | 8,419,298 |
At The Market Stock Sales |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Proceeds from sale of common stock weighted average price per share (USD per share) | $ 25.12 |  |  |  |

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