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Stockholders' Equity (Narrative) (Details) - USD ($) |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 21, 2024 | Mar. 29, 2024 | Dec. 14, 2023 | Sep. 14, 2023 | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2023
Stockholders' Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value per share |  |  |  |  | $ 0.01 | $ 0.01 |  |  | $ 0.01 |  |  | $ 0.01
Preferred stock redeemed, value |  |  |  |  |  |  |  | $ 9,650,000 |  |  | $ 14,730,000 |
Series H Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate |  |  |  | 3.50% |  | 3.50% | 3.50% | 3.50% |  | 3.50% | 3.50% |
Preferred stock redeemed, shares |  |  |  | 22 |  | 1,101 |  |  |  |  |  |
Preferred stock, redemption price |  |  |  | $ 10,000 |  | $ 10,000 |  |  |  |  |  | $ 10,000
Preferred stock redeemed, value |  |  |  | $ 220,000 |  | $ 11,000,000.0 |  |  |  |  |  |
Series D Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate |  |  |  |  |  |  |  | 4.50% |  |  | 4.50% |
Series I Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate |  |  |  |  | 3.00% |  | 3.00% | 3.00% | 3.00% | 3.00% | 3.00% | 3.00%
Series G Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate |  |  |  |  |  |  |  | 6.00% |  |  | 6.00% |
Series J Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value per share | $ 0.01 | $ 0.01 | $ 0.01 |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate |  |  |  |  | 8.00% |  |  |  | 8.00% |  |  | 8.00%
Proceeds from issuance of private placement | $ 670,000 | $ 2,690,000 | $ 15,270,000 |  |  |  |  |  |  |  |  |
Shares issued | 67 | 269 | 1,527 |  |  |  |  |  |  |  |  |

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