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SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 31, 2016 USD ($) shares | Apr. 29, 2016 USD ($) shares | Sep. 30, 2016 USD ($) $ / shares shares | Sep. 30, 2016 USD ($) $ / shares shares | Sep. 30, 2015 USD ($) shares | Jun. 30, 2016 USD ($) | Dec. 31, 2015 shares
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Proceeds from issuance of common stock | $ |  |  |  | $ 357,262,000 | $ 26,933,000 |  |
Operating Partnership, as General Partner or Managing Member |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Limited partners' capital account, units issued (in shares) | shares |  |  | 442,478 | 442,478 |  |  |
Limited partners' common OP units (in shares) | shares |  |  | 3,308,875 | 3,308,875 |  |  | 2,931,198
Common stock |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Common stock issued during the period (in shares) | shares | 4,830,000 |  |  |  |  |  |
Gross proceeds from issuance of common stock | $ | $ 175,200,000 |  |  |  |  |  |
Proceeds from issuance of common stock | $ | $ 172,100,000 |  |  |  |  |  |
Series A Preferred Stock | Operating Partnership, as General Partner or Managing Member |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Limited partners' common OP units (in shares) | shares |  |  | 188 | 188 | 188 |  | 188
Series C Preferred Stock | Operating Partnership, as General Partner or Managing Member |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Limited partners' capital account, units issued (in shares) | shares |  |  | 141,593 | 141,593 |  |  |
Limited partners' value per unit (in dollars per share) | $ / shares |  |  | $ 100.00 | $ 100.00 |  |  |
Limited partners' quarterly distribution (in dollars per share) | $ / shares |  |  | $ 0.9375 |  |  |  |
Limited partners' common OP units (in shares) | shares |  |  | 141,593 | 141,593 | 141,593 |  |
At The Market Equity Program | Common stock |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Common stock issued during the period (in shares) | shares |  |  |  | 4,600,000.0 |  |  |
Gross proceeds from issuance of common stock | $ |  |  |  | $ 158,800,000 |  |  |
Proceeds from issuance of common stock | $ |  |  |  | $ 156,800,000 |  |  |
Additional maximum gross proceeds amount | $ |  |  | $ 250,000,000 |  |  |  |
Sale of stock, remaining value under program | $ |  |  | $ 218,000,000 |  |  |  |
LTIP Units |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Share-based compensation, outstanding (in shares) | shares |  |  | 1,163,841 | 1,163,841 |  |  | 929,169
At The Market Equity Program |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Common stock, shares authorized not issued, value | $ |  |  |  |  |  | $ 200,000,000.0 |
Forward Sale and Underwritten Public Offering | Common stock |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Common stock issued during the period (in shares) | shares |  | 3,600,000 | 867,612 |  |  |  |
Proceeds from issuance of common stock | $ |  | $ 124,500,000 | $ 30,000,000 |  |  |  |
Minimum | Series C Preferred Stock | Operating Partnership, as General Partner or Managing Member |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  |  | $ 28.80 | $ 28.80 |  |  |
Share price, conversion ratio |  |  |  | 3.4722 |  |  |
Maximum | Series C Preferred Stock | Operating Partnership, as General Partner or Managing Member |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  |  | $ 35.20 | $ 35.20 |  |  |
Share price, conversion ratio |  |  |  | 2.8409 |  |  |

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