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REDEEMABLE PREFERRED STOCK - Series D Preferred Stock Narrative (Details) - $ / shares |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 15, 2021 | Dec. 15, 2020 | Nov. 16, 2020 | Sep. 02, 2020 | Feb. 29, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2020 | Jun. 29, 2020 | Jun. 28, 2020 | Dec. 31, 2019
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock redemption, trading days prior to redemption |  |  |  |  | 20 days |  |  |  | 20 days |  |  |
Series D Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in usd per share) |  |  |  |  | $ 25.00 | $ 0.001 |  |  | $ 0.001 |  |  | $ 0.001
Cumulative dividend rate |  |  |  |  | 5.65% |  |  |  |  |  |  |
Preferred dividend per share per quarter (in usd per share) |  |  |  |  | $ 0.35313 |  |  |  |  |  |  |
Preferred dividends declared (in usd per share) |  |  |  | $ 0.353125 |  |  |  |  |  |  |  |
Preferred dividends paid, per share amount (in usd per share) |  |  |  |  |  | $ 0.35313 | $ 0.35313 | $ 0.588542 |  |  |  |
Series D Preferred Stock | Continuous Public Offering |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Purchase price (in usd per share) |  |  |  |  |  |  |  |  |  | $ 24.50 | $ 25.00 |
Series D Preferred Stock | Forecast |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred dividends paid, per share amount (in usd per share) | $ 0.117708 | $ 0.117708 | $ 0.117708 |  |  |  |  |  |  |  |  |

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