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REDEEMABLE PREFERRED STOCK - Series L Preferred Stock (Details) - USD ($) |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 20, 2019 | Nov. 20, 2019 | Nov. 21, 2017 | Nov. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Redeemable preferred stock redemptions |  |  |  |  | $ 1,000 | $ 0 | $ 67,000 | $ 8,000 |
Initial dividend on common stock | $ 4,380,645 |  |  |  |  |  |  |  |
Initial dividend, common stock, paid |  |  |  |  |  |  | $ 3,319,274 | $ 12,045,000 |
Series L Preferred Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  | 8,080,740 |  | 8,080,740 |  | 8,080,740 |  | 5,387,160
Preferred stock, liquidation preference per share (in usd per share) |  |  |  |  | $ 28.37 |  | $ 28.37 |  | $ 28.37
Cumulative dividend rate |  |  | 5.50% |  |  |  |  |  |
Preferred dividend per share per year (in usd per share) |  |  | $ 1.56035 |  |  |  |  |  |
Failure to declare or pay distributions, temporary increase per year |  |  | 1.00% |  |  |  |  |  |
Failure to declare or pay distributions, temporary increase per year, maximum increase |  |  | 8.50% |  |  |  |  |  |
Minimum fixed charge coverage ratio |  |  | 125.00% |  |  |  |  |  |
Series L Preferred Stock | Tender Offer |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Shares repurchased (in shares) |  |  |  | 2,693,580 |  |  |  |  |
Purchase price (in usd per share) |  |  |  | $ 29.12 |  |  |  |  |
Preferred dividends declared (in usd per share) |  | $ 1.39 |  |  |  |  |  |  |
Dividends, preferred stock, aggregate value |  | $ 3,744,000 |  |  |  |  |  |  |
Professional fees |  |  |  | $ 462,000 |  |  |  |  |
Cost to repurchase tendered shares |  |  |  | $ 75,155,000 |  |  |  |  |
Redeemable preferred stock redemptions |  |  |  |  |  |  |  |  | $ 5,873,000
Series L Preferred Stock | Registration Statement |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock, liquidation preference per share (in usd per share) |  |  | $ 28.37 |  |  |  |  |  |

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