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Earnings Per Common Share and Stockholders' Equity (Stockholders' Equity) (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Jun. 10, 2020 | Nov. 21, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Class of Stock [Line Items] |  |  |  |  |
Proceeds from issuance of preferred stock, net |  |  | $ 290,260 | $ 388,893 | $ 0
Dividends paid on preferred stock |  |  | $ 33,515 |  |
Preferred Stock, Series B |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, shares issued | 12,000 |  | 12,000 | 0 |
Preferred stock dividend rate, percentage | 6.625% |  |  |  |
Preferred stock, par value (dollars per share) | $ 1.00 |  | $ 1 |  |
Preferred stock, liquidation preference, per share | $ 25,000 |  |  |  |
Proceeds from issuance of preferred stock, net | $ 290,300 |  |  |  |
Dividends paid on preferred stock |  |  | $ 9,000 |  |
Preferred Stock, Series A |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, shares issued |  | 16,000 | 16,000 | 16,000 |
Preferred stock dividend rate, percentage |  | 5.95% |  |  |
Preferred stock, par value (dollars per share) |  | $ 1.00 | $ 1 | $ 1 |
Preferred stock, liquidation preference, per share |  | $ 25,000 |  |  |
Proceeds from issuance of preferred stock, net |  | $ 388,900 |  |  |
Dividends paid on preferred stock |  |  | $ 24,500 |  |

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