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Equity - Preferred Stock (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Class of Stock [Line Items] |  |  |  |  |
Carrying value prior to redemption | $ 282,490,000 | $ 282,490,000 |  | $ 282,490,000 |
Liquidation preference (in dollars per share) | $ 25 | $ 25 |  | $ 25 |
Preferred Stock |  |  |  |  |
Shares Issued and Outstanding (in shares) | 12,200,000 | 12,200,000 |  | 12,200,000 |
Liquidation Preference (in dollars per share) | $ 25 | $ 25 |  | $ 25 |
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 |  | 360 days |
Number of months used in the computation of preferred stock dividends for any partial dividend period |  | 12 months |  | 12 months |
Number of days in month, dividends computation of dividends payable for any partial dividend period |  | 30 days |  | 30 days |
Preferred stock dividends declared and paid |  | $ 5,874,000 | $ 8,124,000 |  |
Capital gains distribution (as a percent) |  |  | 100.00% |  |
Unrecaptured Section 1250 gain (s a percent) |  |  | 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 |  | 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 |  | 10 days |
Series E and F Preferred Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Carrying value prior to redemption |  |  |  |  | $ 193,500,000
Preferred Stock |  |  |  |  |
Carrying Value |  |  |  |  | $ 193,500,000
Series D, E, F, G and I Preferred Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Liquidation preference (in dollars per share) |  |  |  |  | $ 50.00
Preferred Stock |  |  |  |  |
Liquidation Preference (in dollars per share) |  |  |  |  | $ 50.00
Series D |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Carrying value prior to redemption | $ 89,041,000 | $ 89,041,000 |  | $ 89,041,000 |
Liquidation preference (in dollars per share) | $ 25 | $ 25.00 |  | $ 25 |
Preferred Stock |  |  |  |  |
Shares Issued and Outstanding (in 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 | $ 25.00 |  | $ 25 |
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 |  | $ 89,041,000 |
Preferred stock dividends declared and paid |  | 2,000,000.0 | $ 2,000,000 |  |
Series G |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Carrying value prior to redemption | $ 72,664,000 | $ 72,664,000 |  | $ 72,664,000 |
Liquidation preference (in dollars per share) | $ 25 | $ 25.00 |  | $ 25 |
Preferred Stock |  |  |  |  |
Shares Issued and Outstanding (in 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 | $ 25.00 |  | $ 25 |
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 |  | $ 72,664,000 |
Preferred stock dividends declared and paid |  | 1,500,000 | 1,500,000 |  |
Series I |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Carrying value prior to redemption | $ 120,785,000 | $ 120,785,000 |  | $ 120,785,000 |
Liquidation preference (in dollars per share) | $ 25 | $ 25.00 |  | $ 25 |
Preferred Stock |  |  |  |  |
Shares Issued and Outstanding (in 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 | $ 25.00 |  | $ 25 |
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 |  | $ 120,785,000 |
Preferred stock dividends declared and paid |  | $ 2,300,000 | 2,300,000 |  |
Series J (convertible) |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares issued upon conversion (in shares) | 16,500,000 |  |  |  |
Conversion rate (in shares) | 4.125 |  |  | 4.125 |
Carrying value prior to redemption | $ 0 |  |  | $ 0 |
Liquidation preference (in dollars per share) | $ 50 |  |  | $ 50 |
Preferred Stock |  |  |  |  |
Shares Issued and Outstanding (in shares) | 0 |  |  | 0 |
Par Value (in dollars per share) | $ 0.001 |  |  | $ 0.001 |
Liquidation Preference (in dollars per share) | $ 50 |  |  | $ 50 |
Rate per Annum |  |  |  | 4.50% |
Annual Dividend Per Share (in dollars per share) |  |  |  | $ 2.25 |
Carrying Value | $ 0 |  |  | $ 0 |
Preferred stock dividends declared and paid |  |  | $ 2,300,000 |  |
Redemption price as a percentage of liquidation preference |  | 100.00% |  |  |

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