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Equity - Monthly Distributions Declared and Paid by Company's Board of Directors (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Apr. 04, 2019
Series A Preferred Stock |  |  |
Class of Stock [Line Items] |  |  |
Distributions per Preferred Share (in dollars per share) | $ 0.3984375 | $ 0.3984375 |
Series B Preferred Stock |  |  |
Class of Stock [Line Items] |  |  |
Distributions per Preferred Share (in dollars per share) | 0.375 | 0 |
Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Distributions per Common Share (in dollars per share) | $ 0.13335 | $ 0.13275 |
Subsequent Event | Series B Preferred Stock |  |  |
Class of Stock [Line Items] |  |  |
Dividends Payable |  |  | $ 236

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