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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Preferred Stock |
Class of Stock [Line Items] |
Schedule of Dividends Payable | The following table presents the relevant dates with respect to such quarterly cash dividends on the Series B Preferred Stock commencing January 1, 2015 through December 31, 2017 and on each of the Series C Preferred Stock and Series D Preferred Stock from its respective time of original issuance through December 31, 2017:
|  |  |  |  |  | Cash Dividend Per Share |
Declaration Date |  | Record Date |  | Payment Date |  | Series B Preferred Stock |  | Series C Preferred Stock |  | Series D Preferred Stock |
December 7, 2017 |  | January 1, 2018 |  | January 15, 2018 |  | $ | 0.484375 |  |  | $ | 0.4921875 |  |  | $ | 0.51111 |  | (2)
September 14, 2017 |  | October 1, 2017 |  | October 15, 2017 |  | 0.484375 |  |  | 0.4921875 |  |  | — |
June 14, 2017 |  | July 1, 2017 |  | July 15, 2017 |  | 0.484375 |  |  | 0.4921875 |  |  | — |
March 16, 2017 |  | April 1, 2017 |  | April 15, 2017 |  | 0.484375 |  |  | 0.4921875 |  |  | — |
December 15, 2016 |  | January 1, 2017 |  | January 15, 2017 |  | 0.484375 |  |  | 0.4921875 |  |  | — |
September 15, 2016 |  | October 1, 2016 |  | October 15, 2016 |  | 0.484375 |  |  | 0.4921875 |  |  | — |
June 16, 2016 |  | July 1, 2016 |  | July 15, 2016 |  | 0.484375 |  |  | 0.4921875 |  |  | — |
March 18, 2016 |  | April 1, 2016 |  | April 15, 2016 |  | 0.484375 |  |  | 0.4921875 |  |  | — |
December 16, 2015 |  | January 1, 2016 |  | January 15, 2016 |  | 0.484375 |  |  | 0.4921875 |  |  | — |
September 18, 2015 |  | October 1, 2015 |  | October 15, 2015 |  | 0.484375 |  |  | 0.4921875 |  |  | — |
June 18, 2015 |  | July 1, 2015 |  | July 15, 2015 |  | 0.484375 |  |  | 0.4539100 |  | (1) | — |
March 18, 2015 |  | April 1, 2015 |  | April 15, 2015 |  | 0.484375 |  |  | — |  | — |
(1)Cash dividend for the partial quarterly period that began on April 22, 2015 and ended on July 14, 2015. (2)Cash dividend for the partial quarterly period that began on October 13, 2017 and ended on January 14, 2018.
Common Stock |
Class of Stock [Line Items] |
Schedule of Dividends Payable | The following table presents cash dividends declared by the Company on its common stock with respect to each of the quarterly periods commencing January 1, 2015 and ended December 31, 2017:
Period |  | Declaration Date |  | Record Date |  | Payment Date |  | Cash Dividend Per Share
Fourth Quarter 2017 |  | December 7, 2017 |  | December 18, 2017 |  | January 25, 2018 |  | $ | 0.20 |
Third Quarter 2017 |  | September 14, 2017 |  | September 25, 2017 |  | October 25, 2017 |  | 0.20 |
Second Quarter 2017 |  | June 14, 2017 |  | June 26, 2017 |  | July 25, 2017 |  | 0.20 |
First Quarter 2017 |  | March 16, 2017 |  | March 27, 2017 |  | April 25, 2017 |  | 0.20 |
Fourth Quarter 2016 |  | December 15, 2016 |  | December 27, 2016 |  | January 26, 2017 |  | 0.24 |
Third Quarter 2016 |  | September 15, 2016 |  | September 26, 2016 |  | October 28, 2016 |  | 0.24 |
Second Quarter 2016 |  | June 16, 2016 |  | June 27, 2016 |  | July 25, 2016 |  | 0.24 |
First Quarter 2016 |  | March 18, 2016 |  | March 28, 2016 |  | April 25, 2016 |  | 0.24 |
Fourth Quarter 2015 |  | December 16, 2015 |  | December 28, 2015 |  | January 25, 2016 |  | 0.24 |
Third Quarter 2015 |  | September 18, 2015 |  | September 28, 2015 |  | October 26, 2015 |  | 0.24 |
Second Quarter 2015 |  | June 18, 2015 |  | June 29, 2015 |  | July 27, 2015 |  | 0.27 |
First Quarter 2015 |  | March 18, 2015 |  | March 30, 2015 |  | April 27, 2015 |  | 0.27 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tabular disclosure of all or some of the information related to dividends declared, but not paid, as of the financial reporting date. + 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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