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Shareholders' Equity (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended | 0 Months Ended
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2014 | Jan. 13, 2014 | Mar. 31, 2014 Series B [Member] | Mar. 31, 2013 Series B [Member] | Dec. 31, 2013 Series B [Member] | Mar. 31, 2014 Series A [Member] | Mar. 31, 2013 Series A [Member] | Apr. 24, 2014 Subsequent Event [Member] | Apr. 24, 2014 Subsequent Event [Member] Series B [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Public offering, shares |  | 6,900,000 |  |  |  |  |  |  |
Shares issued to underwriters |  | 900,000 |  |  |  |  |  |  |
Dividend rate percentage |  |  | 7.25% | 7.25% |  | 8.875% | 8.875% |  |
Public offering, realized net proceeds, net offering expenses |  | $ 41.3 |  |  |  |  |  |  |
At-the-market program, shares authorized | 10,000,000 |  |  |  |  |  |  |  |
At-the-market program, shares sold | 0 |  |  |  |  |  |  |  |
Liquidation preference, per share |  |  | $ 25.00 |  | $ 25.00 |  |  |  |
Common stock, dividends declared |  |  |  |  |  |  |  | $ 0.05 |
Preferred stock dividends declared |  |  |  |  |  |  |  |  | $ 0.453125
Dividends payable, date declared | Apr. 24, 2014 |  |  |  |  |  |  |  |
Dividends payable, date to be paid | May 20, 2014 |  |  |  |  |  |  |  |
Dividends payable, date of record | May 09, 2014 |  |  |  |  |  |  |  |

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