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Subsequent Events - Monthly Distributions Declared by Company's Board of Directors (Details) - $ / shares | 6 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Sep. 24, 2019 | Sep. 17, 2019 | Aug. 22, 2019 | Aug. 20, 2019 | Jul. 24, 2019 | Jul. 22, 2019 | Jul. 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 | Jul. 22, 2019 |  |  |  |  |  |  |
Payment Date | Jul. 31, 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 | Aug. 20, 2019 |  |  |  |  |  |  |
Payment Date | Aug. 30, 2019 |  |  |  |  |  |  |
Series A Preferred Stock | Period Three |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Record Date | Sep. 17, 2019 |  |  |  |  |  |  |
Payment Date | Sep. 30, 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 | Jul. 24, 2019 |  |  |  |  |  |  |
Payment Date | Aug. 02, 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 | Aug. 22, 2019 |  |  |  |  |  |  |
Payment Date | Aug. 30, 2019 |  |  |  |  |  |  |
Series B Preferred Stock | Period Three |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Record Date | Sep. 24, 2019 |  |  |  |  |  |  |
Payment Date | Oct. 03, 2019 |  |  |  |  |  |  |
Common Stock | Subsequent Event |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Distribution per Share |  |  |  |  |  |  |  | $ 0.13365
Common Stock | Period One |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Record Date | Jul. 22, 2019 |  |  |  |  |  |  |
Payment Date | Jul. 31, 2019 |  |  |  |  |  |  |
Common Stock | Period One | Subsequent Event |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Distribution per Share |  |  |  |  |  |  | $ 0.04455 |
Common Stock | Period Two |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Record Date | Aug. 20, 2019 |  |  |  |  |  |  |
Payment Date | Aug. 30, 2019 |  |  |  |  |  |  |
Common Stock | Period Three |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Record Date | Sep. 17, 2019 |  |  |  |  |  |  |
Payment Date | Sep. 30, 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 |  |  |  |  | $ 0.04455 |  |  |
Forecast | Common Stock | Period Three |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Distribution per Share |  |  | $ 0.04455 |  |  |  |  |

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