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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 01, 2020 | Aug. 31, 2020 | Aug. 10, 2020 | Jul. 13, 2020 | Dec. 30, 2019 | Feb. 25, 2019 | Jan. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Stockholders' Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock redeemed, value |  |  |  |  |  |  |  | $ 10,345 |  | $ 10,485 |  |
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  |  | $ 195 | $ 6,487 |
Series H Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate | 3.50% |  |  | 3.50% |  |  |  | 3.50% |  | 3.50% |  |
Proceeds from issuance of private placement | $ 5,900 |  |  | $ 3,100 |  |  |  |  |  |  |  |
Shares issued | 590 |  |  | 308 |  |  |  |  |  |  |  |
Series F Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate |  | 6.00% |  |  |  |  |  | 6.00% | 6.00% | 6.00% | 6.00% | 6.00%
Preferred stock redeemed, shares |  | 6,465 |  |  |  |  |  |  |  |  |  |
Preferred stock, redemption price |  | $ 1,000 |  |  |  |  |  |  |  |  |  |
Preferred stock redeemed, value |  | $ 6,500 |  |  |  |  |  |  |  |  |  |
Series C Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate |  |  | 6.00% |  |  |  |  | 6.00% | 6.00% | 6.00% | 6.00% | 6.00%
Preferred stock redeemed, shares |  |  | 388 |  |  |  |  |  |  |  |  |
Preferred stock, redemption price |  |  | $ 10,000 |  |  |  |  |  |  |  |  |
Preferred stock redeemed, value |  |  | $ 3,900 |  |  |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of private placement |  |  |  |  |  | $ 6,300 |  |  |  |  |  |
Shares issued |  |  |  |  | 1,020,408 | 496,224 |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  | $ 12,500 |  |  |  |  |  |  |
Series G Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate |  |  |  |  |  |  | 6.00% | 6.00% | 6.00% | 6.00% | 6.00% | 6.00%
Proceeds from issuance of private placement |  |  |  |  |  |  | $ 5,300 |  |  |  |  |
Shares issued |  |  |  |  |  |  | 533 |  |  |  |  |
Directors And Officers [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Shares issued |  |  |  |  |  | 286,244 |  |  |  |  |  |

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