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Equity (Preferred Stock) (Details) - USD ($) $ / shares in Units, shares in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Preferred Stock |  |  |
Shares Issued and Outstanding (in shares) | 12,200 |  | 12,200
Liquidation Preference (in dollars per share) | $ 25.00 |  | $ 25.00
Carrying Value | $ 282,490,000 |  | $ 282,490,000
Number of days in year used in the computation of preferred stock dividends for any partial dividend period | 360 days |  |
Number of months used in the computation of preferred stock dividends for any partial dividend period | 12 months |  |
Number of days in month, dividends computation of dividends payable for any partial dividend period | 30 days |  |
Preferred stock dividends declared and paid | $ 5,874,000 | $ 5,874,000 |
Capital gains distribution |  | 100.00% |
Amount of preferred dividends in arrears | $ 0 |  |
Liquidation preference (in dollars per share) | $ 25.00 |  | $ 25.00
Maximum |  |  |
Preferred Stock |  |  |
Number of days prior to dividend payment date that Board of Directors may elect to designate as the payment date | 30 days |  |
Minimum |  |  |
Preferred Stock |  |  |
Number of days prior to dividend payment date that Board of Directors may elect to designate as the payment date | 10 days |  |
Series D |  |  |
Preferred Stock |  |  |
Shares Issued and Outstanding (in shares) | 4,000 |  | 4,000
Par Value (in dollars per share) | $ 0.001 |  | $ 0.001
Liquidation Preference (in dollars per share) | $ 25.00 |  | $ 25.00
Rate per Annum | 8.00% |  | 8.00%
Annual Dividend Per Share (in dollars per share) | $ 2.00 |  | $ 2.00
Carrying Value | $ 89,041,000 |  | $ 89,041,000
Preferred stock dividends declared and paid | $ 2,000,000.0 | $ 2,000,000.0 |
Liquidation preference (in dollars per share) | $ 25.00 |  | $ 25.00
Series G |  |  |
Preferred Stock |  |  |
Shares Issued and Outstanding (in shares) | 3,200 |  | 3,200
Par Value (in dollars per share) | $ 0.001 |  | $ 0.001
Liquidation Preference (in dollars per share) | $ 25.00 |  | $ 25.00
Rate per Annum | 7.65% |  | 7.65%
Annual Dividend Per Share (in dollars per share) | $ 1.91 |  | $ 1.91
Carrying Value | $ 72,664,000 |  | $ 72,664,000
Preferred stock dividends declared and paid | $ 1,500,000 | 1,500,000 |
Liquidation preference (in dollars per share) | $ 25.00 |  | $ 25.00
Series I |  |  |
Preferred Stock |  |  |
Shares Issued and Outstanding (in shares) | 5,000 |  | 5,000
Par Value (in dollars per share) | $ 0.001 |  | $ 0.001
Liquidation Preference (in dollars per share) | $ 25.00 |  | $ 25.00
Rate per Annum | 7.50% |  | 7.50%
Annual Dividend Per Share (in dollars per share) | $ 1.88 |  | $ 1.88
Carrying Value | $ 120,785,000 |  | $ 120,785,000
Preferred stock dividends declared and paid | $ 2,300,000 | $ 2,300,000 |
Liquidation preference (in dollars per share) | $ 25.00 |  | $ 25.00
Series G And I Preferred Stock |  |  |
Preferred Stock |  |  |
Liquidation Preference (in dollars per share) | $ 25.00 |  |
Redemption price as a percentage of liquidation preference | 100.00% |  |
Liquidation preference (in dollars per share) | $ 25.00 |  |

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