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Stockholders' Equity - Dividends Declared (Details) - $ / shares |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 10, 2019 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared (in dollars per share) |  | $ 0.35 | $ 0.35 | $ 0.35 | $ 0.40 | $ 0.46 | $ 0.46 | $ 0.46 | $ 0.46 | $ 1.45 | $ 1.84 | $ 1.84
Dividends declared (in dollars per share) |  |  |  |  |  |  |  |  |  | 2.00 | 2.72 | 4.00
Common stock dividends distribution (in dollar per share) |  |  |  |  |  | $ 0.35 |  |  |  |  |  |
Common Stock(1) |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared (in dollars per share) |  |  |  |  |  |  |  |  |  | 1.45 | 1.84 | 1.84
Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 2.00 | 2.00 | 2.00
Series C Preferred Stock(2) |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared (in dollars per share) | $ 0.2223 |  |  |  |  |  |  |  |  |  | $ 0.7223 | $ 2.00

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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