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Shareholders' Equity (Details) - $ / shares | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Class of Stock [Line Items] |  |
Preferred stock, shares authorized | 50,000,000 | 50,000,000
Preferred stock, par value | $ 0.01 | $ 0.01
Preferred stock, shares issued | 5,908,999 | 5,888,680
Preferred Stock, Liquidation Preference Per Share | $ 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 | $ 0.18 |
Series A Preferred Stock |  |
Class of Stock [Line Items] |  |
Preferred stock, shares authorized | 8,000,000 |
Preferred stock, shares issued | 2,300,000 | 2,300,000
Preferred Stock, Dividend Rate, Percentage | 8.50% |
Series B Preferred Stock |  |
Class of Stock [Line Items] |  |
Preferred stock, shares authorized | 7,000,000 |
Preferred stock, shares issued | 3,608,999 | 3,588,680
Preferred Stock, Dividend Rate, Percentage | 7.625% |
Preferred Stock |  |
Class of Stock [Line Items] |  |
Dividends Payable, Date to be Paid | Apr. 16, 2018 |
Dividends Payable, Date of Record | Apr. 01, 2018 |
Common Stock |  |
Class of Stock [Line Items] |  |
Dividends Payable, Date to be Paid | Apr. 30, 2018 |
Dividends Payable, Date of Record | Apr. 03, 2018 |

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