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Shareholders' Equity (Details) - $ / shares | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized | 50,000,000 |  |  |  | 50,000,000 |  |  |  | 50,000,000
Preferred stock, par value | $ 0.01 |  |  |  | $ 0.01 |  |  |  | $ 0.01
Preferred stock, shares issued | 5,888,680 |  |  |  | 4,571,937 |  |  |  | 5,888,680
Preferred Stock, Liquidation Preference Per Share | $ 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 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.21 | $ 0.21 | $ 0.21 | $ 0.21 |
Series A Preferred Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized | 8,000,000 |  |  |  |  |  |  |  | 8,000,000
Preferred stock, shares issued | 2,300,000 |  |  |  | 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 |  |  |  |  |  |  |  | 7,000,000
Preferred stock, shares issued | 3,588,680 |  |  |  | 2,271,937 |  |  |  | 3,588,680
Preferred Stock, Dividend Rate, Percentage |  |  |  |  |  |  |  |  | 7.625%
Preferred Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Dividends Payable, Date to be Paid | Jan. 15, 2018 |  |  |  |  |  |  |  |
Dividends Payable, Date of Record | Jan. 01, 2018 |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Dividends Payable, Date to be Paid | Jan. 31, 2018 |  |  |  |  |  |  |  |
Dividends Payable, Date of Record | Dec. 29, 2017 |  |  |  |  |  |  |  |

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