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Stockholders' Equity (Dividends) (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 31, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Class of Stock [Line Items] |  |  |  |  |  |
Common stock dividends |  | $ 88,270 | $ 81,074 | $ 176,418 | $ 161,639 |
Common stock dividends per share (in dollars per share) |  | $ 0.515 | $ 0.500 | $ 1.030 | $ 1.000 |
Common stock dividends declared (in dollars per share) |  | $ 0.515 | $ 0.500 | $ 1.030 | $ 1.000 |
Subsequent event |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Common stock dividends declared (in dollars per share) | $ 0.52 |  |  |  |  |
Series E Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock dividends |  | $ 0 | $ 4,096 | $ 0 | $ 8,194 |
Preferred stock dividends per depositary share (in dollars per share) |  | $ 0 | $ 0.356250 | $ 0 | $ 0.712500 |
Dividend rate |  |  |  | 5.70% |  |
Series F Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock dividends |  | $ 4,485 | $ 4,485 | $ 8,970 | $ 8,970 |
Preferred stock dividends per depositary share (in dollars per share) |  | $ 0.325000 | $ 0.325000 | $ 0.650000 | $ 0.650000 |
Dividend rate |  |  |  | 5.20% |  | 5.20%

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