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Shareholders' Equity (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 0 Months Ended | 3 Months Ended | 6 Months Ended |  | 0 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jul. 26, 2013 | Jul. 26, 2013 Series B [Member] | Mar. 31, 2013 Series B [Member] | Jun. 30, 2013 Series B [Member] | Feb. 12, 2013 Series B [Member] | Mar. 11, 2013 Series A [Member] | Jun. 30, 2013 Series A [Member]
Public offering, shares |  |  |  |  | 2,000,000 |  |
Dividend rate percentage |  |  |  | 7.25% |  |  | 8.875%
Public offering, per share |  |  |  |  | $ 24.58 |  |
Public offering, realized net proceeds, net offering expenses |  |  |  |  | $ 47.6 |  |
Additional shares issued to underwriters |  |  |  |  | 300,000 |  |
Net proceeds realized from issuance of additional shares to underwriters |  |  |  |  | 7.1 |  |
ATM equity program, shares issued |  |  | 221,000 |  |  |  |
ATM equity program, weighted average price per share |  |  | $ 24.52 |  |  |  |
ATM equity program, realized net proceeds, net offering expenses |  |  | 5.2 |  |  |  |
Shares of Redeemable Preferred Stock redeemed and purchased |  |  |  |  |  | 1,408,000 |
Total cash outlay for Redeemable Preferred Stock shares redeemed and purchased |  |  |  |  |  | $ 35.4 |
Common stock, dividends declared | $ 0.05 |  |  |  |  |  |
Preferred stock, dividends declared |  | $ 0.453125 |  |  |  |  |

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