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Income Taxes Summary of the Average Taxable Nature of Dividends (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Income Tax Contingency [Line Items] |  |  |  |  |
Allocation of Dividend Payments |  | $ 0.349355 |  | $ 0.12252 |
Common [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Total dividends per share, common | $ 0.525 | $ 0.46 |  | $ 0.40 |
Taxable percentage allocation on dividends | 100.00% | 100.00% |  | 100.00% |
Common [Member] | Ordinary Income [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Taxable percentage allocation on dividends | 95.68% | 47.33% |  | 99.11% |
Common [Member] | Fifteen Percent Rate, Qualifying Dividend [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Taxable percentage allocation on dividends | 0.99% | 1.11% |  | 0.89% |
Common [Member] | Fifteen Percent Rate Gain [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Taxable percentage allocation on dividends | 0.00% | 0.00% |  | 0.00% |
Common [Member] | Twenty Five Percent Rate Gain [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Taxable percentage allocation on dividends | 0.00% | 0.00% |  | 0.00% |
Common [Member] | Return of Capital [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Taxable percentage allocation on dividends | 3.33% | 51.56% |  | 0.00% |
Series B Cumulative Redeemable Preferred Shares [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Total dividends per share, preferred | $ 1.341667 | $ 2.0125 |  | $ 2.0125 |
Taxable percentage allocation on dividends | 100.00% | 100.00% |  | 100.00% |
Series B Cumulative Redeemable Preferred Shares [Member] | Ordinary Income [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Taxable percentage allocation on dividends | 98.98% | 97.70% |  | 99.11% |
Series B Cumulative Redeemable Preferred Shares [Member] | Fifteen Percent Rate, Qualifying Dividend [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Taxable percentage allocation on dividends | 1.02% | 2.30% |  | 0.89% |
Series B Cumulative Redeemable Preferred Shares [Member] | Fifteen Percent Rate Gain [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Taxable percentage allocation on dividends | 0.00% | 0.00% |  | 0.00% |
Series B Cumulative Redeemable Preferred Shares [Member] | Twenty Five Percent Rate Gain [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Taxable percentage allocation on dividends | 0.00% | 0.00% |  | 0.00% |
Series C |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Total dividends per share, preferred | $ 3.25 | $ 3.25 |  | $ 3.25 |
Taxable percentage allocation on dividends | 100.00% | 100.00% |  | 100.00% |
Series C | Ordinary Income [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Taxable percentage allocation on dividends | 98.98% | 97.70% |  | 99.11% |
Series C | Fifteen Percent Rate, Qualifying Dividend [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Taxable percentage allocation on dividends | 1.02% | 2.30% |  | 0.89% |
Series C | Fifteen Percent Rate Gain [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Taxable percentage allocation on dividends | 0.00% | 0.00% |  | 0.00% |
Series C | Twenty Five Percent Rate Gain [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Taxable percentage allocation on dividends | 0.00% | 0.00% |  | 0.00% |
Series C | Return of Capital [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Taxable percentage allocation on dividends | 0.00% | 0.00% |  | 0.00% |
Series D Cumulative Redeemable Preferred Shares [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Total dividends per share, preferred | $ 1.8875 | $ 1.76498 | [1] | $ 2.01002 | [1]
Taxable percentage allocation on dividends | 100.00% | 100.00% |  | 100.00% |
Series D Cumulative Redeemable Preferred Shares [Member] | Ordinary Income [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Taxable percentage allocation on dividends | 98.98% | 97.70% |  | 99.11% |
Series D Cumulative Redeemable Preferred Shares [Member] | Fifteen Percent Rate, Qualifying Dividend [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Taxable percentage allocation on dividends | 1.02% | 2.30% |  | 0.89% |
Series D Cumulative Redeemable Preferred Shares [Member] | Fifteen Percent Rate Gain [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Taxable percentage allocation on dividends | 0.00% | 0.00% |  | 0.00% |
Series D Cumulative Redeemable Preferred Shares [Member] | Twenty Five Percent Rate Gain [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Taxable percentage allocation on dividends | 0.00% | 0.00% |  | 0.00% |
[1] | Of the total dividend paid in January 2011, $0.12252 is allocated to 2010 and $0.349355 is allocated to 2011.

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 + Details
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