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SHAREHOLDERS' EQUITY AND PARTNERS' CAPITAL - Allocations of Dividends and Declared and Paid for Income Tax Purposes (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 16, 2019 | Oct. 16, 2018 | Jul. 16, 2018 | Apr. 17, 2018 | Jan. 16, 2018 | Jan. 16, 2017 | Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock cash dividends per share (USD per share) |  | $ 0.200 | $ 0.200 | $ 0.20 | $ 0.20 | $ 0.265 |  |  |  |
Cash distributions paid |  |  |  |  |  |  | $ 12,949 |  |  |
Accrued dividends and distributions payable |  |  |  |  |  |  | $ 34,217 | $ 34,217 |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock cash dividends per share (USD per share) | $ 0.075 |  |  |  |  |  |  |  |  |
Tax Year 2019 | Subsequent Event |  |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock cash dividends per share (USD per share) | $ 0.075 |  |  |  |  |  |  |  |  |
Tax Year 2018 |  |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock cash dividends per share (USD per share) |  |  |  |  | $ 0.20 |  |  |  |  |
Tax Year 2016 |  |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock cash dividends per share (USD per share) |  |  |  |  |  | 0.081 |  |  |  |
Tax Year 2017 |  |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock cash dividends per share (USD per share) |  |  |  |  |  | $ 0.184 |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends declared (USD per share) |  |  |  |  |  |  |  | $ 0.80000 | $ 0.97970004 | $ 0.876
Allocations |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Common Stock | Ordinary income |  |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Allocations |  |  |  |  |  |  |  | 82.83% | 85.37% | 100.00%
Common Stock | Capital gains 25% rate |  |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Allocations |  |  |  |  |  |  |  | 0.00% | 0.00% | 0.00%
Common Stock | Return of capital |  |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Allocations |  |  |  |  |  |  |  | 17.17% | 14.63% | 0.00%
Series D preferred stock |  |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends declared (USD per share) |  |  |  |  |  |  |  | $ 18.4375 | $ 18.4375 | $ 18.4375
Series E preferred stock |  |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends declared (USD per share) |  |  |  |  |  |  |  | $ 16.562500 | $ 16.562500 | $ 16.562500
Preferred Stock |  |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Allocations |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Preferred Stock | Ordinary income |  |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Allocations |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Preferred Stock | Capital gains 25% rate |  |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Allocations |  |  |  |  |  |  |  | 0.00% | 0.00% | 0.00%

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