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Shareholders' Equity (Details) - $ / shares | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2019 | May 31, 2019 | Apr. 30, 2019 | Mar. 31, 2019 | Feb. 28, 2019 | Jan. 31, 2019 | Jun. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Reverse Stock Splits |  |  |  |  |  |  |  |  | 49,210,493 |
Dividends Payable, Date Declared, Month and Year |  | Jun. 06, 2019 | May 16, 2019 | Apr. 10, 2019 | Mar. 12, 2019 | Jan. 28, 2019 | Jan. 07, 2019 |  |  |
Preferred stock, shares authorized |  | 50,000,000 |  |  |  |  |  | 50,000,000 | 50,000,000 | 50,000,000
Preferred stock, par value |  | $ 0.01 |  |  |  |  |  | $ 0.01 | $ 0.01 | $ 0.01
Preferred stock, shares issued |  | 6,514,130 |  |  |  |  |  | 6,514,130 | 6,514,130 | 5,954,594
Preferred Stock, Liquidation Preference Per Share |  | $ 25.00 |  |  |  |  |  | $ 25.00 | $ 25.00 |
Preferred Stock, Dividend Payment Terms |  |  |  |  |  |  |  |  | The Series A Preferred Stock pays a cumulative cash dividend equivalent to 8.50% of the $25.00 liquidation preference per share each year and the Series B Preferred Stock pays a cumulative cash dividend equivalent to 7.625% of the $25.00 liquidation preference per share each year. |
Dividends declared per common share | [1] | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.18 |  |  |
Series A Preferred Stock |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  | 8,000,000 |  |  |  |  |  | 8,000,000 | 8,000,000 |
Preferred stock, shares issued |  | 2,300,000 |  |  |  |  |  | 2,300,000 | 2,300,000 | 2,300,000
Preferred Stock, Dividend Rate, Percentage |  |  |  |  |  |  |  |  | 8.50% |
Preferred Stock, Dividends Per Share, Declared |  |  |  |  |  |  |  | $ 0.053125 |  |
Series B Preferred Stock |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  | 7,000,000 |  |  |  |  |  | 7,000,000 | 7,000,000 |
Preferred stock, shares issued |  | 4,214,130 |  |  |  |  |  | 4,214,130 | 4,214,130 | 3,654,594
Preferred Stock, Dividend Rate, Percentage |  |  |  |  |  |  |  |  | 7.625% |
Preferred Stock, Dividends Per Share, Declared |  |  |  |  |  |  |  | $ 0.4765625 |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends Payable, Date to be Paid |  |  |  |  |  |  |  | Jul. 15, 2019 |  |
Dividends Payable, Date of Record |  |  |  |  |  |  |  |  | Jul. 01, 2019 |
Common Stock |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends Payable, Date to be Paid |  | Jul. 03, 2019 | Jun. 07, 2019 | May 01, 2019 | Apr. 01, 2019 | Feb. 28, 2019 | Jan. 31, 2019 |  |  |
Dividends Payable, Date of Record |  | Jun. 26, 2019 | May 28, 2019 | Apr. 22, 2019 | Mar. 22, 2019 | Feb. 14, 2019 | Jan. 18, 2019 |  |  |
[1] | Amounts declared have been adjusted to reflect the effect of the 1-for-3 reverse stock split.

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