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Capital Stock - Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands | Apr. 15, 2022 | Mar. 17, 2022 | Jan. 18, 2022 | Oct. 20, 2021 | Apr. 09, 2021 | Dec. 15, 2020 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dividends |  |  |  |  |  |  |  |
Restricted cash |  |  |  |  |  |  | $ 837 | $ 2,049
8.625% Series A Cumulative, Perpetual Preferred Stock |  |  |  |  |  |  |  |
Dividends |  |  |  |  |  |  |  |
Cash dividend declared (in dollars per share) |  | $ 0.53906 |  | $ 0.53906 |  |  |  |
Cash dividend paid (in dollars per share) |  |  | $ 0.53906 |  |  |  |  |
Issuance of stock, net (in shares) |  |  |  |  |  | 984,000 |  |
Series B Depositary Shares |  |  |  |  |  |  |  |
Dividends |  |  |  |  |  |  |  |
Cash dividend declared (in dollars per share) |  | $ 0.52344 |  | $ 0.52344 |  |  |  |
Cash dividend paid (in dollars per share) |  |  | $ 0.52344 |  |  |  |  |
Issuance of stock, net (in shares) |  |  |  |  | 1,600,000 |  |  |
Subsequent Event | 8.625% Series A Cumulative, Perpetual Preferred Stock |  |  |  |  |  |  |  |
Dividends |  |  |  |  |  |  |  |
Cash dividend paid (in dollars per share) | $ 0.53906 |  |  |  |  |  |  |
Subsequent Event | Series B Depositary Shares |  |  |  |  |  |  |  |
Dividends |  |  |  |  |  |  |  |
Cash dividend paid (in dollars per share) | $ 0.52344 |  |  |  |  |  |  |

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