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Shareholders' Equity (Allocations of Dividends and Declared and Paid For Income Tax Purposes) (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Common Stock [Member] |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |
Allocation of Dividends Declared and Paid | $ 0.83 | [1] | $ 0.84 |  | $ 0.80 |
Percentage of Allocation of Dividends Declared and Paid | 100.00% |  | 100.00% |  | 100.00% |
Series C Preferred Stock [Member] |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |
Allocation of Dividends Declared and Paid | $ 14.53 | [2] | $ 19.38 |  | $ 19.38 |
Series D Preferred Stock [Member] |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |
Allocation of Dividends Declared and Paid | $ 18.44 |  | $ 18.44 |  | $ 18.44 |
Series E Preferred Stock [Member] |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |
Allocation of Dividends Declared and Paid | $ 3.91 | [3] |  |  |  |
Preferred Stock [Member] |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |
Percentage of Allocation of Dividends Declared and Paid | 100.00% | [4] | 100.00% | [4] | 100.00% | [4]
Ordinary Income [Member] | Common Stock [Member] |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |
Percentage of Allocation of Dividends Declared and Paid | 100.00% |  | 100.00% |  | 100.00% |
Ordinary Income [Member] | Preferred Stock [Member] |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |
Percentage of Allocation of Dividends Declared and Paid | 100.00% | [4] | 100.00% | [4] | 100.00% | [4]
Capital Gains 25% rate [Member] | Common Stock [Member] |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |
Percentage of Allocation of Dividends Declared and Paid | 0.00% |  | 0.00% |  | 0.00% |
Capital Gains 25% rate [Member] | Preferred Stock [Member] |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |
Percentage of Allocation of Dividends Declared and Paid | 0.00% | [4] | 0.00% | [4] | 0.00% | [4]
Return of Captial [Member] | Common Stock [Member] |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |
Percentage of Allocation of Dividends Declared and Paid | 0.00% |  | 0.00% |  | 0.00% |
[1] | Of the $0.22 per share dividend declared on November 18, 2012 and paid January 16, 2013, $0.17 per share is taxable in 2012 and $0.05 per share will be reported and is taxable in 2013.
[2] | Represents the three regular quarterly dividends paid in 2012, prior to the redemption on November 5, 2012.
[3] | Represents dividends for the partial quarter covering October 5, 2012 through December 31, 2012.
[4] | The allocations for income tax purposes are the same for each series of preferred stock for each period presented.

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- Definition Percentage of Allocation of Dividends Declared and Paid + References No definition available. + Details
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- Details
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