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Income Taxes Summary of the Average Taxable Nature of Dividends (Details) (USD $) | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2013 Common [Member] | Dec. 31, 2012 Common [Member] | Dec. 31, 2011 Common [Member] | Dec. 31, 2013 Common [Member] Ordinary Income [Member] | Dec. 31, 2012 Common [Member] Ordinary Income [Member] | Dec. 31, 2011 Common [Member] Ordinary Income [Member] | Dec. 31, 2013 Common [Member] Fifteen Percent Rate, Qualifying Dividend [Member] | Dec. 31, 2012 Common [Member] Fifteen Percent Rate, Qualifying Dividend [Member] | Dec. 31, 2011 Common [Member] Fifteen Percent Rate, Qualifying Dividend [Member] | Dec. 31, 2013 Common [Member] Fifteen Percent Rate Gain [Member] | Dec. 31, 2012 Common [Member] Fifteen Percent Rate Gain [Member] | Dec. 31, 2011 Common [Member] Fifteen Percent Rate Gain [Member] | Dec. 31, 2013 Common [Member] Twenty Five Percent Rate Gain [Member] | Dec. 31, 2012 Common [Member] Twenty Five Percent Rate Gain [Member] | Dec. 31, 2011 Common [Member] Twenty Five Percent Rate Gain [Member] | Dec. 31, 2013 Common [Member] Return of Capital [Member] | Dec. 31, 2012 Common [Member] Return of Capital [Member] | Dec. 31, 2011 Common [Member] Return of Capital [Member] | Dec. 31, 2013 Series B Cumulative Redeemable Preferred Shares [Member] | Dec. 31, 2012 Series B Cumulative Redeemable Preferred Shares [Member] | Dec. 31, 2011 Series B Cumulative Redeemable Preferred Shares [Member] | Dec. 31, 2013 Series B Cumulative Redeemable Preferred Shares [Member] Ordinary Income [Member] | Dec. 31, 2012 Series B Cumulative Redeemable Preferred Shares [Member] Ordinary Income [Member] | Dec. 31, 2011 Series B Cumulative Redeemable Preferred Shares [Member] Ordinary Income [Member] | Dec. 31, 2013 Series B Cumulative Redeemable Preferred Shares [Member] Fifteen Percent Rate, Qualifying Dividend [Member] | Dec. 31, 2012 Series B Cumulative Redeemable Preferred Shares [Member] Fifteen Percent Rate, Qualifying Dividend [Member] | Dec. 31, 2011 Series B Cumulative Redeemable Preferred Shares [Member] Fifteen Percent Rate, Qualifying Dividend [Member] | Dec. 31, 2013 Series B Cumulative Redeemable Preferred Shares [Member] Fifteen Percent Rate Gain [Member] | Dec. 31, 2012 Series B Cumulative Redeemable Preferred Shares [Member] Fifteen Percent Rate Gain [Member] | Dec. 31, 2011 Series B Cumulative Redeemable Preferred Shares [Member] Fifteen Percent Rate Gain [Member] | Dec. 31, 2013 Series B Cumulative Redeemable Preferred Shares [Member] Twenty Five Percent Rate Gain [Member] | Dec. 31, 2012 Series B Cumulative Redeemable Preferred Shares [Member] Twenty Five Percent Rate Gain [Member] | Dec. 31, 2011 Series B Cumulative Redeemable Preferred Shares [Member] Twenty Five Percent Rate Gain [Member] | Dec. 31, 2013 Series C Cumulative Redeemable Preferred Shares [Member] | Dec. 31, 2012 Series C Cumulative Redeemable Preferred Shares [Member] | Dec. 31, 2011 Series C Cumulative Redeemable Preferred Shares [Member] | Dec. 31, 2013 Series C Cumulative Redeemable Preferred Shares [Member] Ordinary Income [Member] | Dec. 31, 2012 Series C Cumulative Redeemable Preferred Shares [Member] Ordinary Income [Member] | Dec. 31, 2011 Series C Cumulative Redeemable Preferred Shares [Member] Ordinary Income [Member] | Dec. 31, 2013 Series C Cumulative Redeemable Preferred Shares [Member] Fifteen Percent Rate, Qualifying Dividend [Member] | Dec. 31, 2012 Series C Cumulative Redeemable Preferred Shares [Member] Fifteen Percent Rate, Qualifying Dividend [Member] | Dec. 31, 2011 Series C Cumulative Redeemable Preferred Shares [Member] Fifteen Percent Rate, Qualifying Dividend [Member] | Dec. 31, 2013 Series C Cumulative Redeemable Preferred Shares [Member] Fifteen Percent Rate Gain [Member] | Dec. 31, 2012 Series C Cumulative Redeemable Preferred Shares [Member] Fifteen Percent Rate Gain [Member] | Dec. 31, 2011 Series C Cumulative Redeemable Preferred Shares [Member] Fifteen Percent Rate Gain [Member] | Dec. 31, 2013 Series C Cumulative Redeemable Preferred Shares [Member] Twenty Five Percent Rate Gain [Member] | Dec. 31, 2012 Series C Cumulative Redeemable Preferred Shares [Member] Twenty Five Percent Rate Gain [Member] | Dec. 31, 2011 Series C Cumulative Redeemable Preferred Shares [Member] Twenty Five Percent Rate Gain [Member] | Dec. 31, 2013 Series C Cumulative Redeemable Preferred Shares [Member] Return of Capital [Member] | Dec. 31, 2012 Series C Cumulative Redeemable Preferred Shares [Member] Return of Capital [Member] | Dec. 31, 2011 Series C Cumulative Redeemable Preferred Shares [Member] Return of Capital [Member] | Dec. 31, 2013 Series D Cumulative Redeemable Preferred Shares [Member] | Dec. 31, 2012 Series D Cumulative Redeemable Preferred Shares [Member] | Dec. 31, 2011 Series D Cumulative Redeemable Preferred Shares [Member] | Dec. 31, 2013 Series D Cumulative Redeemable Preferred Shares [Member] Ordinary Income [Member] | Dec. 31, 2012 Series D Cumulative Redeemable Preferred Shares [Member] Ordinary Income [Member] | Dec. 31, 2011 Series D Cumulative Redeemable Preferred Shares [Member] Ordinary Income [Member] | Dec. 31, 2013 Series D Cumulative Redeemable Preferred Shares [Member] Fifteen Percent Rate, Qualifying Dividend [Member] | Dec. 31, 2012 Series D Cumulative Redeemable Preferred Shares [Member] Fifteen Percent Rate, Qualifying Dividend [Member] | Dec. 31, 2011 Series D Cumulative Redeemable Preferred Shares [Member] Fifteen Percent Rate, Qualifying Dividend [Member] | Dec. 31, 2013 Series D Cumulative Redeemable Preferred Shares [Member] Fifteen Percent Rate Gain [Member] | Dec. 31, 2012 Series D Cumulative Redeemable Preferred Shares [Member] Fifteen Percent Rate Gain [Member] | Dec. 31, 2011 Series D Cumulative Redeemable Preferred Shares [Member] Fifteen Percent Rate Gain [Member] | Dec. 31, 2013 Series D Cumulative Redeemable Preferred Shares [Member] Twenty Five Percent Rate Gain [Member] | Dec. 31, 2012 Series D Cumulative Redeemable Preferred Shares [Member] Twenty Five Percent Rate Gain [Member] | Dec. 31, 2011 Series D Cumulative Redeemable Preferred Shares [Member] Twenty Five Percent Rate Gain [Member]
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allocation of Dividend Payments | $ 0.349355 | $ 0.12252 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total dividends per share, common |  |  | $ 0.60 | $ 0.525 | $ 0.46 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total dividends per share, preferred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 1.341667 | $ 2.0125 |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.25 | $ 3.25 | $ 3.25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.043368 | $ 1.8875 | $ 1.76498 |  |  |  |  |  |  |  |  |  |  |  |
Taxable percentage allocation on dividends |  |  | 100.00% | 100.00% | 100.00% | 35.53% | 95.68% | 47.33% | 4.11% | 0.99% | 1.11% | 2.09% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 58.27% | 3.33% | 51.56% | 0.00% | 100.00% | 100.00% | 0.00% | 98.98% | 97.70% | 0.00% | 1.02% | 2.30% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 100.00% | 100.00% | 100.00% | 85.14% | 98.98% | 97.70% | 9.85% | 1.02% | 2.30% | 5.01% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 100.00% | 100.00% | 100.00% | 85.14% | 98.98% | 97.70% | 9.85% | 1.02% | 2.30% | 5.01% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00%

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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=27012166&loc=d3e187085-122770 + Details
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