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Stockholders' Equity (Dividends on Common Stock) (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 14, 2021 | Sep. 15, 2021 | Jun. 15, 2021 | Mar. 12, 2021 | Dec. 17, 2020 | Aug. 06, 2020 | Dec. 12, 2019 | Sep. 12, 2019 | Jun. 12, 2019 | Mar. 06, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Mar. 11, 2020
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend declared, never paid (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.80
Common stock, cash dividends declared (in dollars per share) | $ 0.440 | $ 0.400 | $ 0.400 | $ 0.300 | $ 0.300 | $ 0.200 | $ 0.800 | $ 0.800 | $ 0.800 | $ 0.800 | $ 1.540 | $ 0.500 | $ 3.20 |
Dividends and dividend equivalents declared and unpaid |  |  |  |  |  |  |  |  |  |  | $ 47,751 | $ 34,016 | $ 90,749 |
Return of capital (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 1.0512 | $ 0.20 |  |
Common stock dividends, capital gains (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.6688 |

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