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SHAREHOLDERS' EQUITY AND PARTNERS' CAPITAL - Allocations of Dividends and Declared and Paid for Income Tax Purposes (Details) - USD ($) |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 16, 2019 | Jan. 16, 2019 | Jan. 16, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |
Common stock cash dividends per share |  | $ 0.075 |  |  |  |  |  |  |
Accrued dividends and distributions payable |  |  |  |  |  | $ 12,949,000 |  |  |
Tax Year 2018 |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |
Common stock cash dividends per share |  |  |  | $ 0.200 |  |  |  |  |
Tax Year 2019 |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |
Common stock cash dividends per share |  |  | $ 0.075 |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |
Dividends declared |  |  |  |  | $ 0.15 | $ 0.80 | [1] | $ 0.98 | [2]
Allocations |  |  |  |  | 100.00% | 100.00% |  | 100.00% |
Common Stock | Ordinary income |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |
Allocations |  |  |  |  |  | 82.83% |  | 85.37% |
Common Stock | Return of capital |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |
Allocations |  |  |  |  | 100.00% | 17.17% |  | 14.63% |
Preferred Stock |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |
Allocations | [3] |  |  |  | 100.00% | 100.00% |  | 100.00% |
Preferred Stock | Ordinary income |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |
Allocations | [3] |  |  |  |  | 100.00% |  | 100.00% |
Preferred Stock | Return of capital |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |
Allocations | [3] |  |  |  | 100.00% |  |  |  |
Series D Preferred Stock |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |
Dividends declared |  |  |  |  | $ 13.83 | $ 18.44 |  | $ 18.44 |
Series E Preferred Stock |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |
Dividends declared |  |  |  |  | $ 12.42 | $ 16.56 |  | $ 16.56 |
[1] | Of the $ 0.075 per share dividend declared on October 29, 2018 and paid January 16, 2019, $0.075 was reported and is taxable in 2019.
[2] | Of the $0.200 per share dividend declared on November 2, 2017 and paid January 16, 2018, $ 0.200 was reported and is taxable in 2018.
[3] | The allocations for income tax purposes are the same for each series of preferred stock for each period presented.

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