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Equity (Preferred Stock) (Details) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) mo $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares
Preferred Stock |  |  |
Shares issued and outstanding (in shares) | shares | 12,200,000 | 12,200,000 | 12,200,000
Liquidation preference (in dollars per share) | $ 25.00 | $ 25.00 | $ 25.00
Carrying value | $ | $ 282,490,000 | $ 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 |
Dividends payable for any partial dividend period number of months | mo |  | 12 |
Number of days in month, dividends computation of dividends payable for any partial dividend period |  | 30 days |
Capital gains distribution percentage |  | 100.00% | 100.00%
Unrecaptured Section 1250 gain percentage |  |  | 34.01%
Amount of preferred dividends in arrears | $ |  | $ 0 |
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 |
Convertible Preferred Stock Series J |  |  |
Class of Stock [Line Items] |  |  |
Common stock to redeem outstanding shares | shares | 16,500,000 |  |
Shares issued upon conversion | shares | 4.125 |  | 4.125
Preferred Stock |  |  |
Liquidation preference (in dollars per share) | $ 50.00 |  | $ 50.00
Carrying value | $ | $ 193,500,000 |  | $ 193,500,000
Dividends declared and paid | $ |  |  | $ 9,000,000.0
Series D |  |  |
Preferred Stock |  |  |
Shares issued and outstanding (in shares) | shares | 4,000,000 | 4,000,000 | 4,000,000
Par value (in dollars per share) | $ 0.001 | $ 0.001 | $ 0.001
Liquidation preference (in dollars per share) | $ 25.00 | $ 25.00 | $ 25.00
Rate per annum |  | 8.00% | 8.00%
Equivalent to fixed annual rate (in dollars per share) |  | $ 2.00 | $ 2.00
Carrying value | $ | $ 89,041,000 | $ 89,041,000 | $ 89,041,000
Dividends declared and paid | $ |  | $ 8,000,000.0 | $ 8,000,000.0
Series G |  |  |
Preferred Stock |  |  |
Shares issued and outstanding (in shares) | shares | 3,200,000 | 3,200,000 | 3,200,000
Par value (in dollars per share) | $ 0.001 | $ 0.001 | $ 0.001
Liquidation preference (in dollars per share) | $ 25.00 | $ 25.00 | $ 25.00
Rate per annum |  | 7.65% | 7.65%
Equivalent to fixed annual rate (in dollars per share) |  | $ 1.91 | $ 1.91
Carrying value | $ | $ 72,664,000 | $ 72,664,000 | $ 72,664,000
Dividends declared and paid | $ |  | $ 6,100,000 | $ 6,100,000
Series I |  |  |
Preferred Stock |  |  |
Shares issued and outstanding (in shares) | shares | 5,000,000 | 5,000,000 | 5,000,000
Par value (in dollars per share) | $ 0.001 | $ 0.001 | $ 0.001
Liquidation preference (in dollars per share) | $ 25.00 | $ 25.00 | $ 25.00
Rate per annum |  | 7.50% | 7.50%
Equivalent to fixed annual rate (in dollars per share) |  | $ 1.88 | $ 1.88
Carrying value | $ | $ 120,785,000 | $ 120,785,000 | $ 120,785,000
Dividends declared and paid | $ |  | $ 9,400,000 | $ 9,400,000
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% |

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