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EQUITY AND MEZZANINE EQUITY - Additional Information (Details) - USD ($) |  |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 05, 2019 | Feb. 26, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | Nov. 30, 2019 | Dec. 31, 2018
Equity |  |  |  |  |  |  |
Noncontrolling interests - operating partnership (in shares) |  |  | 1,043,000 |  | 1,100,000 |  | 1,058,000
Common stock outstanding (in shares) |  |  | 12,163,000 |  | 12,100,000 |  | 12,098,000
Sale of common shares, net |  |  | $ 3,352,000 |  |  |  |
Repurchase period | 1 year |  |  |  |  |  |
Remaining authorized repurchase amount |  |  | $ 46,900,000 |  |  |  |
Preferred shares of beneficial interest, shares outstanding (in shares) |  |  | 4,000,000.0 |  | 4,100,000 |  |
Preferred shares, liquidation preference (in dollars per share) |  |  | $ 25.00 |  |  |  |
Preferred shares, annual distribution accrual rate (in dollars per share) |  |  | $ 1.65625 |  |  |  |
Preferred shares, dividend rate |  |  | 6.625% |  |  |  |
Preferred shares liquidation preference |  |  | $ 99,600,000 |  |  |  |
Partnership units, converted (in shares) |  | 1.37931 |  |  |  |  |
Conversion price (in dollars per share) |  | $ 72.50 |  |  |  |  |
Series D Preferred Units |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |
Preferred units, shares issued (in shares) |  | 165,600 | 166,000 |  |  |  | 166,000
Preferred units, par value (in dollars per share) |  | $ 100 | $ 100 |  |  |  | $ 100
Distribution rate |  | 3.862% |  |  |  |  |
Share Repurchase Program |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |
Aggregate gross sales price of common share of beneficial interest allowed to be repurchased | $ 50,000,000 |  |  |  |  |  |
At-The-Market Offering |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |
Aggregate gross sales price of common shares |  |  | $ 124,300,000 |  |  | $ 150,000,000.0 |
Common Shares of Beneficial interest, shares issued (in shares) |  |  | 50,000 |  |  |  |
Average per share price of common shares issued (in dollars per share) |  |  | $ 68.04 |  |  |  |
Net consideration for common shares |  |  | $ 3,400,000 |  |  |  |
2015 Incentive Plan |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |
Equity awards issued (in shares) |  |  | 1,193 | 207 |  |  |
Sale of common shares, net |  |  | $ 125,000 | $ 10,000 |  |  |

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