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SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS (Details) (USD $) | 6 Months Ended |  |  |  |  | 6 Months Ended | 3 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended |  |
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 Operating Partnership, as General Partner or Managing Member | Dec. 31, 2012 Operating Partnership, as General Partner or Managing Member | Jun. 30, 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 | Jun. 30, 2013 At The Market Equity Program [Member] Common stock | Jun. 30, 2013 New At The Market Equity Program [Member] | Jun. 30, 2013 New At The Market Equity Program [Member] | Apr. 30, 2013 New At The Market Equity Program [Member] Common stock | Jun. 30, 2013 New At The Market Equity Program [Member] Common stock | Jun. 30, 2013 LTIP Units | Dec. 31, 2012 LTIP Units
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from issuance of common stock |  |  |  |  |  |  | $ 125,000,000 | $ 20,900,000 | $ 77,100,000 |  |  |  |
Common stock issued during the period |  |  |  |  |  |  | 4,900,000.0 |  | 2,800,000 |  | 700,000.0 |  |
Proceeds from issuance of common stock | 75,871,000 | 60,717,000 |  |  |  |  | 123,100,000 |  | 76,000,000 |  | 20,600,000 |  |
Stock Issue Program, Authorized Amount |  |  |  |  |  |  |  |  |  | $ 150,000,000 |  |  |
Limited partners' common OP units |  |  | 224,134 | 284,097 | 188 | 188 |  |  |  |  |  |  |
Share-based compensation, outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  | 367,522 | 168,357

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