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EQUITY - Narrative (Details) $ / shares in Units, $ in Thousands |  |  | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 30, 2016 USD ($) $ / shares shares | Jun. 28, 2016 USD ($) shares | Jun. 30, 2016 USD ($) $ / shares shares | Dec. 31, 2015 $ / shares shares | Aug. 02, 2016
Class of Stock [Line Items] |  |  |  |  |
Common stock, shares authorized | shares | 500,000,000 |  | 500,000,000 | 500,000,000 |
Common stock, par value (in dollars per share) | $ 0.01 |  | $ 0.01 | $ 0.01 |
Preferred stock, shares authorized | shares | 100,000,000 |  | 100,000,000 | 100,000,000 |
Preferred stock, par value (in dollars per share) | $ 0.01 |  | $ 0.01 | $ 0.01 |
Net proceeds from sale of preferred stock | $ |  |  | $ 72,337 |  |
Undesignated preferred stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, shares authorized | shares | 88,600,000 |  | 88,600,000 |  |
9.25% Series A Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, shares authorized | shares | 2,000,000 |  | 2,000,000 |  |
Preferred stock, dividend rate (as a percent) |  |  | 9.25% | 9.25% |
Preferred stock, liquidation preference (in dollars per share) | $ 25 |  | $ 25 |  |
Annual dividend rate per share (in dollars per share) |  |  | $ 2.3125 |  |
9.25% Series A Preferred Stock | Maximum |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Ratio for conversion |  |  | 5.92417 |  |
7.875% Series B Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, shares authorized | shares | 3,000,000 |  | 3,000,000 |  |
Preferred stock, dividend rate (as a percent) |  |  | 7.875% | 7.875% |
Preferred stock, liquidation preference (in dollars per share) | $ 25 |  | $ 25 |  |
Annual dividend rate per share (in dollars per share) |  |  | $ 1.96875 |  |
7.875% Series B Preferred Stock | Maximum |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Ratio for conversion |  |  | 5.6497 |  |
7.125% Series C Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, shares authorized | shares | 3,400,000 |  | 3,400,000 |  |
Preferred stock, dividend rate (as a percent) |  |  | 7.125% | 7.125% |
Preferred stock, liquidation preference (in dollars per share) | $ 25 |  | $ 25 |  |
Annual dividend rate per share (in dollars per share) |  |  | $ 1.78125 |  |
7.125% Series C Preferred Stock | Maximum |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Ratio for conversion |  |  | 5.1440 |  |
6.450% Series D Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, shares authorized | shares | 3,000,000 |  | 3,000,000 |  |
Preferred stock, dividend rate (as a percent) |  |  | 6.45% |  |
Net proceeds from sale of preferred stock (in shares) | shares |  | 3,000,000 |  |  |
Net proceeds from sale of preferred stock | $ |  | $ 72,300 |  |  |
Underwriting discount and offering-related expenses | $ |  | $ 2,700 |  |  |
Preferred stock, liquidation preference (in dollars per share) | $ 25 |  | $ 25 |  |
Annual dividend rate per share (in dollars per share) |  |  | $ 1.6125 |  |
6.450% Series D Preferred Stock | Maximum |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Ratio for conversion |  |  | 3.9216 |  |
Operating partnership | Non-controlling Interests in Operating Partnership |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of common units of operating partnership owned by unaffiliated third parties | shares | 462,385 |  | 462,385 | 516,021 |
Percentage of limited partnership interest in operating partnership |  |  | 1.00% | 1.00% |
Leasehold Venture |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Payments to acquire interest in joint venture | $ | $ 400 |  |  |  |
Leasehold Venture | Subsequent Event |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  |  |  | 100.00%

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