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Subsequent Events - Monthly Distributions Declared by Company's Board of Directors (Details) - $ / shares | 3 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2019 | Jun. 26, 2019 | Jun. 19, 2019 | May 22, 2019 | Apr. 24, 2019 | Apr. 22, 2019 | Apr. 09, 2019
Series A Preferred Stock | Subsequent Event |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Distribution per Share |  |  |  |  |  |  | $ 0.3984375
Series A Preferred Stock | Period One |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Record Date | Apr. 22, 2019 |  |  |  |  |  |
Payment Date | Apr. 30, 2019 |  |  |  |  |  |
Series A Preferred Stock | Period One | Subsequent Event |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Distribution per Share |  |  |  |  |  | $ 0.1328125 |
Series A Preferred Stock | Period Two |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Record Date | May 22, 2019 |  |  |  |  |  |
Payment Date | May 31, 2019 |  |  |  |  |  |
Series A Preferred Stock | Period Three |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Record Date | Jun. 19, 2019 |  |  |  |  |  |
Payment Date | Jun. 28, 2019 |  |  |  |  |  |
Series B Preferred Stock | Subsequent Event |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Distribution per Share |  |  |  |  |  |  | 0.375
Series B Preferred Stock | Period One |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Record Date | Apr. 24, 2019 |  |  |  |  |  |
Payment Date | May 03, 2019 |  |  |  |  |  |
Series B Preferred Stock | Period One | Subsequent Event |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Distribution per Share |  |  |  |  | $ 0.125 |  |
Series B Preferred Stock | Period Two |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Record Date | May 22, 2019 |  |  |  |  |  |
Payment Date | May 31, 2019 |  |  |  |  |  |
Series B Preferred Stock | Period Three |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Record Date | Jun. 26, 2019 |  |  |  |  |  |
Payment Date | Jul. 05, 2019 |  |  |  |  |  |
Common Stock | Subsequent Event |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Distribution per Share |  |  |  |  |  |  | $ 0.13350
Common Stock | Period One |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Record Date | Apr. 22, 2019 |  |  |  |  |  |
Payment Date | Apr. 30, 2019 |  |  |  |  |  |
Common Stock | Period One | Subsequent Event |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Distribution per Share |  |  |  |  |  | $ 0.04450 |
Common Stock | Period Two |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Record Date | May 22, 2019 |  |  |  |  |  |
Payment Date | May 31, 2019 |  |  |  |  |  |
Common Stock | Period Three |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Record Date | Jun. 19, 2019 |  |  |  |  |  |
Payment Date | Jun. 28, 2019 |  |  |  |  |  |
Forecast | Series A Preferred Stock | Period Two |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Distribution per Share |  |  |  | $ 0.1328125 |  |  |
Forecast | Series A Preferred Stock | Period Three |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Distribution per Share |  |  | $ 0.1328125 |  |  |  |
Forecast | Series B Preferred Stock | Period Two |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Distribution per Share |  |  |  | 0.125 |  |  |
Forecast | Series B Preferred Stock | Period Three |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Distribution per Share |  | $ 0.125 |  |  |  |  |
Forecast | Common Stock | Period Two |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Distribution per Share |  |  |  | $ 0.04450 |  |  |
Forecast | Common Stock | Period Three |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Distribution per Share |  |  | $ 0.04450 |  |  |  |

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