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Stockholders' Equity - Dividends Declared (Details) - $ / shares | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Class of Stock [Line Items] |  |
Dividends declared (in dollars per share) | $ 0.46 | $ 0.46
Common stock [Member] |  |
Class of Stock [Line Items] |  |
Dividends declared (in dollars per share) | 0.46 |
Series B Preferred Stock [Member] |  |
Class of Stock [Line Items] |  |
Dividends declared (in dollars per share) | 0.5 |
Series C Preferred Stock [Member] |  |
Class of Stock [Line Items] |  |
Dividends declared (in dollars per share) | $ 0.5 |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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