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Stockholders' Equity (Dividends) (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended
--- | --- | ---
Apr. 30, 2021 | Mar. 31, 2021 | Mar. 31, 2020
Class of Stock [Line Items] |  |  |
Preferred stock dividends |  | $ 4,485 | $ 4,485
Common stock dividends |  | $ 90,848 | $ 88,148
Common stock dividends per share (in dollars per share) |  | $ 0.5200 | $ 0.5150
Common stock dividends declared (in dollars per share) |  | $ 0.5200 | $ 0.5150
Subsequent event |  |  |
Class of Stock [Line Items] |  |  |
Common stock dividends declared (in dollars per share) | $ 0.5200 |  |
Series F Preferred Stock |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock dividends |  | $ 4,485 | $ 4,485
Preferred stock dividends per depositary share (in dollars per share) |  | $ 0.3250 | $ 0.3250
Dividend rate |  | 5.20% | 5.20%

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