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SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS (Details) (USD $) | 3 Months Ended |  |  |  |  | 3 Months Ended |  |  | 4 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2013 Operating Partnership, as General Partner or Managing Member | Dec. 31, 2012 Operating Partnership, as General Partner or Managing Member | Mar. 31, 2013 Series A Preferred Stock Operating Partnership, as General Partner or Managing Member | Dec. 31, 2012 Series A Preferred Stock Operating Partnership, as General Partner or Managing Member | Mar. 31, 2013 Common stock | Mar. 31, 2013 LTIP Units | Dec. 31, 2012 LTIP Units | May 08, 2013 Subsequent Event Common stock
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock issued during the period |  |  |  |  |  |  | 2,000,000 |  |  | 4,900,000.0
Gross proceeds from issuance of common stock |  |  |  |  |  |  | $ 53,700,000 |  |  | $ 125,000,000
Proceeds from issuance of common stock | 51,840,000 | 8,029,000 |  |  |  |  | 52,900,000 |  |  | 123,100,000
Stock Issue Program, Authorized Amount |  |  |  |  |  |  | $ 150,000,000 |  |  |
Limited partners' common OP units |  |  | 284,097 | 284,097 | 188 | 188 |  |  |  |
Share-based compensation, outstanding (in shares) |  |  |  |  |  |  |  | 379,522 | 168,357 |

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