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Stockholders' Equity (Dividends on Common Stock) (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |
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Dec. 17, 2020 | Aug. 06, 2020 | Dec. 12, 2019 | Sep. 12, 2019 | Jun. 12, 2019 | Mar. 06, 2019 | Dec. 12, 2018 | Sep. 13, 2018 | Jun. 07, 2018 | Mar. 07, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 11, 2020
Share-based Payment Arrangement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend declared, never paid (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.20
Common stock, cash dividends declared (in dollars per share) | $ 0.075 | $ 0.05 | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.125 | $ 0.80 | $ 0.80 |
Dividends and dividend equivalents declared and unpaid | $ 34,000 |  |  |  |  |  |  |  |  |  | $ 34,016 | $ 90,749 | $ 90,198 |
Return of capital (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 0.05 |  |  |
Common stock dividends, capital gains (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 0.1672 | $ 0.1290 |

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