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Stockholders' Equity (Series B) (Details) |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended
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Nov. 16, 2021 $ / shares | Aug. 26, 2021 $ / shares | May 24, 2021 $ / shares | Feb. 19, 2021 $ / shares | Nov. 18, 2020 $ / shares | Aug. 12, 2020 $ / shares | Jul. 01, 2020 $ / shares | Feb. 28, 2020 $ / shares shares | Nov. 15, 2019 $ / shares | Aug. 09, 2019 $ / shares | May 20, 2019 $ / shares | Feb. 15, 2019 $ / shares | Apr. 15, 2013 $ / shares shares | Mar. 31, 2020 director quarter | Dec. 31, 2021 quarter director $ / shares shares | Dec. 31, 2020 $ / shares shares | Dec. 31, 2019 $ / shares | Dec. 31, 2018 $ / shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum quarters without dividends to get voting rights, in quarters | quarter |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |
Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.50% | 7.50% |  |
Preferred stock, shares issued (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,000,000 | 8,000,000 |  |
Preferred stock, par value (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 | $ 0.01 |  |
Preferred stock, cash dividends declared (in dollars per share) | $ 0.46875 | $ 0.46875 | $ 0.46875 | $ 0.46875 | $ 0.46875 | $ 0.46875 | $ 0.93750 |  | $ 0.46875 | $ 0.46875 | $ 0.46875 | $ 0.46875 |  |  | $ 1.875 | $ 1.875 | $ 1.875 |
Minimum percentage of preferred shareholders required for approval |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 66.67% |  |  |
Series B Preferred Stock | Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate |  |  |  |  |  |  |  | 7.50% |  |  |  |  | 7.50% |  | 7.50% | 7.50% | 7.50% | 7.50%
Preferred stock, shares issued (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  | 8,000,000 |  |  |  |  |
Preferred stock, par value (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 |  |  |  |  |
Preferred stock, liquidation preference (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | 25.00 |  | $ 25.00 | $ 25.00 | $ 25.00 | $ 25.00
Preferred stock, redemption price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 25.00 |  |  |  |  |
Number of additional directors that can be elected by preferred stock holders | director |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |
Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.50% | 6.50% |  |
Preferred stock, shares issued (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,000,000 | 11,000,000 |  |
Preferred stock, par value (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 | $ 0.01 |  |
Preferred stock, cash dividends declared (in dollars per share) | $ 0.40625 | $ 0.40625 | $ 0.40625 | $ 0.40625 | $ 0.40625 | $ 0.40625 | $ 0.53264 |  |  |  |  |  |  |  | $ 1.625 | $ 1.345 |  |
Minimum percentage of preferred shareholders required for approval |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 66.67% |  |  |
Series C Preferred Stock | Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate |  |  |  |  |  |  |  | 6.50% |  |  |  |  |  |  | 6.50% | 6.50% | 6.50% |
Preferred stock, shares issued (in shares) | shares |  |  |  |  |  |  |  | 11,000,000 |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) |  |  |  |  |  |  |  | $ 0.01 |  |  |  |  |  |  |  |  |  |
Preferred stock, liquidation preference (in dollars per share) |  |  |  |  |  |  |  | 25.00 |  |  |  |  |  |  | $ 25.00 | $ 25.00 | $ 25.00 |
Preferred stock, redemption price (in dollars per share) |  |  |  |  |  |  |  | $ 25.00 |  |  |  |  |  |  |  |  |  |
Maximum quarters without dividends to get voting rights, in quarters | quarter |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |
Number of additional directors that can be elected by preferred stock holders | director |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |

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