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Shareholders' Equity (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized | 50,000,000 |  |  |  | 50,000,000 |  |  |  | 50,000,000
Preferred Stock, Par Value Per Share | $ 0.01 |  |  |  | $ 0.01 |  |  |  | $ 0.01
Preferred Stock, Shares Issued | 4,571,937 |  |  |  | 4,550,000 |  |  |  | 4,571,937
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 | $ 0.21 | $ 0.21 | $ 0.21 | $ 0.21 | $ 0.24 | $ 0.24 | $ 0.24 | $ 0.24 |
Stock Repurchase Program, Authorized Amount | $ 40,000,000 |  |  |  |  |  |  |  | $ 40,000,000
Stock Repurchase Program Expiration Date |  |  |  |  |  |  |  |  | Dec. 31, 2018
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 | 2,271,937 |  |  |  | 2,250,000 |  |  |  | 2,271,937
Preferred Stock, Dividend Rate, Percentage |  |  |  |  |  |  |  |  | 7.625%
Preferred Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Dividends Payable, Date to be Paid | Jan. 16, 2017 |  |  |  |  |  |  |  |
Dividends Payable, Date of Record | Jan. 01, 2017 |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Dividends Payable, Date to be Paid | Jan. 31, 2017 |  |  |  |  |  |  |  |
Dividends Payable, Date of Record | Dec. 30, 2016 |  |  |  |  |  |  |  |

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