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SHAREHOLDERS' EQUITY AND PARTNERS' CAPITAL (Common Stock Sold) (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Mar. 01, 2013
Class of Stock [Line Items] |  |  |  |  |  |
Number of Shares Settled |  |  | 278,093 | 246,168 | 8,772,114 |
Common Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Common stock offering, maximum aggregate price |  |  |  |  |  | $ 300,000,000
Common stock offering, maximum commission fee (percent) |  |  |  |  |  | 2.00%
Number of Shares Settled | 6,530,193 | 1,889,105 | 8,419,298 |  | 8,419,298 |
Gross Proceeds | $ 167,034,000 | $ 44,459,000 |  |  | $ 211,493,000 |
Net Proceeds | $ 165,692,000 | $ 43,904,000 |  |  | $ 209,596,000 |
Weighted-average Sales Price (in dollars per share) | $ 25.58 | $ 23.53 |  |  | $ 25.12 |
Common stock offering, maximum remaining aggregate price |  |  | $ 88,507,000 |  |  |

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