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Stockholders' Equity - Cash Dividends Declared - Preferred Stock (Details) - $ / shares | 3 Months Ended
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Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017
Dividends Payable [Line Items] |  |  |  |  |
Declaration Date | Mar. 19, 2018 | Dec. 07, 2017 | Sep. 14, 2017 | Jun. 14, 2017 | Mar. 16, 2017
Record Date | Mar. 29, 2018 | Dec. 18, 2017 | Sep. 25, 2017 | Jun. 26, 2017 | Mar. 27, 2017
Payment Date | Apr. 26, 2018 | Jan. 25, 2018 | Oct. 25, 2017 | Jul. 25, 2017 | Apr. 25, 2017
Series B Preferred Stock |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |
Declaration Date | Mar. 19, 2018 | Dec. 07, 2017 | Sep. 14, 2017 | Jun. 14, 2017 | Mar. 16, 2017
Record Date | Apr. 01, 2018 | Jan. 01, 2018 | Oct. 01, 2017 | Jul. 01, 2017 | Apr. 01, 2017
Payment Date | Apr. 15, 2018 | Jan. 15, 2018 | Oct. 15, 2017 | Jul. 15, 2017 | Apr. 15, 2017
Cash Dividend Per Share (in dollars per share) | $ 0.484375 | $ 0.484375 | $ 0.484375 | $ 0.484375 | $ 0.484375
Series C Preferred Stock |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |
Cash Dividend Per Share (in dollars per share) | 0.4921875 | 0.4921875 | $ 0.4921875 | $ 0.4921875 | $ 0.4921875
Series D Preferred Stock |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |
Cash Dividend Per Share (in dollars per share) | $ 0.50 | $ 0.51111 |  |  |

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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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- Definition Date the dividend to be paid was declared, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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