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Stockholders' Equity (Narrative) (Details) - USD ($) |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
May 01, 2022 | Mar. 24, 2022 | Feb. 04, 2022 | Dec. 21, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Stockholders' Equity Note [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock, par value per share |  |  |  |  | $ 0.01 |  | $ 0.01 |  | $ 0.01
Preferred stock redeemed, value |  |  |  |  | $ 9,650,000 |  | $ 14,730,000 |  |
Series D Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity Note [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate | 4.50% |  |  |  | 4.50% | 4.50% | 4.50% | 4.50% | 4.50%
Preferred stock redeemed, shares | 940 |  |  |  |  |  |  |  |
Preferred stock, redemption price | $ 10,000 |  |  |  |  |  |  |  |
Preferred stock redeemed, value | $ 9,400,000 |  |  |  |  |  |  |  |
Series I Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity Note [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock, par value per share |  | $ 0.01 |  | $ 0.01 |  |  |  |  |
Preferred stock, dividend rate |  |  |  |  | 3.00% |  | 3.00% |  | 3.00%
Proceeds from issuance of private placement |  | $ 2,620,000 |  | $ 3,200,000 |  |  |  |  |
Shares issued |  | 260 |  | 320 |  |  |  |  |
Series G Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity Note [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate |  |  | 6.00% |  |  | 6.00% |  | 6.00% | 6.00%
Preferred stock redeemed, shares |  |  | 533 |  |  |  |  |  |
Preferred stock, redemption price |  |  | $ 10,000 |  |  |  |  |  |
Preferred stock redeemed, value |  |  | $ 5,300,000 |  |  |  |  |  |

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- Definition The percentage rate used to calculate dividend payments on preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 + Details
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- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 + Details
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- Definition The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21488-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21564-112644 + Details
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