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Equity - Schedule of Stock by Class (Details) - USD ($) |  |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 20, 2020 | May 20, 2020 | May 13, 2019 | Jun. 20, 2014 | May 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Series C |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Issuance Cost |  |  |  | $ 1,618,583 |  |  |
Shares Issued (in shares) |  |  |  | 3,000,000 |  | 3,000,000 | 3,000,000
Annual Dividend Rate |  |  |  | 6.00% |  |  |
Liquidation Value (in dollars per share) |  |  |  | $ 25.00 |  |  |
Series C | July 17, 2024, thereafter |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Dividend variable rate |  |  |  |  |  | 3.26% |
Series D |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Issuance Cost |  |  | $ 3,340,456 |  |  |  |
Shares Issued (in shares) |  |  | 4,000,000 |  |  | 4,000,000 | 4,000,000
Annual Dividend Rate |  |  | 5.70% |  |  |  |
Liquidation Value (in dollars per share) |  |  | $ 25.00 |  |  |  |
Series E |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Issuance Cost |  | $ 2,496,750 |  |  | $ 2,500,000 |  |
Shares Issued (in shares) |  | 3,180,000 |  |  | 3,180,000 | 3,180,000 | 3,180,000
Annual Dividend Rate |  | 5.75% |  |  | 5.75% |  |
Liquidation Value (in dollars per share) |  | $ 25.00 |  |  | $ 25.00 |  |
Series F |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Issuance Cost | $ 3,800,000 |  |  |  |  | $ 3,839,902 |
Shares Issued (in shares) | 4,800,000 |  |  |  |  | 4,800,000 | 4,800,000
Annual Dividend Rate | 5.25% |  |  |  |  |  |
Liquidation Value (in dollars per share) | $ 25.00 |  |  |  |  |  |

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