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SHAREHOLDERS' EQUITY AND PARTNERS' CAPITAL (At-The-Market Equity Program) (Details) - USD ($) | 12 Months Ended | 58 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Mar. 01, 2013
Class of Stock [Line Items] |  |  |  |  |
Common stock offering, maximum aggregate price (up to) |  |  |  |  | $ 300,000,000
Commission to sales agent, percent |  |  |  |  | 2.00%
Issuance of shares of stock (in shares) | 348,809 | 335,417 | 278,093 |  |
Common stock offering, maximum remaining aggregate price | $ 88,507,000 |  |  | $ 88,507,000 |
Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Proceeds from Issuance of Common Stock, Gross | 211,493,000 |  |  |  |
Issuance of shares of stock (in shares) |  |  |  | 8,419,298 |
Net proceeds | $ 209,596,000 |  |  |  |
At The Market Stock Sales |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Proceeds from sale of common stock weighted average price per share (in dollars per share) | $ 25.12 |  |  |  |

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