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Capital Stock - Dividends (Details) - $ / shares | Oct. 17, 2022 | Jul. 20, 2022 | Jul. 15, 2022 | May 18, 2022 | Apr. 15, 2022 | Mar. 17, 2022 | Jan. 18, 2022 | Oct. 20, 2021
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8.625% Series A Cumulative, Perpetual Preferred Stock |  |  |  |  |  |  |  |
Dividends |  |  |  |  |  |  |  |
Cash dividend declared (in dollars per share) |  | $ 0.53906 |  | $ 0.53906 |  | $ 0.53906 |  | $ 0.53906
Cash dividend paid (in dollars per share) | $ 0.53906 |  | $ 0.53906 |  | $ 0.53906 |  | $ 0.53906 |
8.375% Series B Cumulative, Perpetual Preferred Stock |  |  |  |  |  |  |  |
Dividends |  |  |  |  |  |  |  |
Cash dividend declared (in dollars per share) |  | $ 0.52344 |  | $ 0.52344 |  | $ 0.52344 |  | $ 0.52344
Cash dividend paid (in dollars per share) | $ 0.52344 |  | $ 0.52344 |  | $ 0.52344 |  | $ 0.52344 |

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