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Stockholders' Equity - Dividends Declared (Details) - $ / shares | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Dividends declared (in dollars per share) | $ 0.46 | $ 0.46 | $ 0.46 | $ 0.46 | $ 0.46 | $ 0.46 | $ 0.46 | $ 0.46 |
Common stock [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Dividends declared (in dollars per share) | $ 0.46 |  | 1.84 | 1.84 |  |  |  |  | $ 1.84
Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Dividends declared (in dollars per share) |  |  | 1.19 | 2.16 |  |  |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Dividends declared (in dollars per share) |  |  | 2 | 2 |  |  |  |  | 2
Series C Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Dividends declared (in dollars per share) |  |  | $ 2 | $ 1 |  |  |  |  | $ 2

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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=27012166&loc=d3e187085-122770 + Details
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