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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 15, 2020 | Sep. 01, 2020 | Aug. 31, 2020 | Aug. 10, 2020 | Jul. 13, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
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%
Proceeds from issuance of private placement | $ 2.2 | $ 5.9 |  |  | $ 3.1 |  |  |  |  |
Shares issued | 225 | 590 |  |  | 308 |  |  |  |  |
Series F Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate |  |  | 6.00% |  |  |  | 6.00% |  | 6.00% |
Preferred stock redeemed, shares |  |  | 6,465 |  |  |  |  |  |  |
Preferred stock, redemption price |  |  | $ 1,000 |  |  |  |  |  |  |
Preferred stock redeemed, value |  |  | $ 6.5 |  |  |  |  |  |  |
Series C Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate |  |  |  | 6.00% |  |  | 6.00% |  | 6.00% |
Preferred stock redeemed, shares |  |  |  | 388 |  |  |  |  |  |
Preferred stock, redemption price |  |  |  | $ 10,000 |  |  |  |  |  |
Preferred stock redeemed, value |  |  |  | $ 3.9 |  |  |  |  |  |
Series G Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate |  |  |  |  |  | 6.00% | 6.00% | 6.00% | 6.00% | 6.00%

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