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Shareholders' Equity (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 31, 2013 | Jul. 31, 2012 | Oct. 31, 2011 | Jul. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Jan. 22, 2013 | Jan. 10, 2013
Distributions |  |  |  |  |  |  |  |  |
Distribution declared to common shareholders (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.39
Distribution declared to common shareholders |  |  |  |  |  |  |  | $ 68,857 |
Distribution to common shareholders (in dollars per share) |  |  |  |  | $ 1.53 | $ 1.49 | $ 1.45 |  |
Dividend distributions as percentage of ordinary income |  |  |  |  | 62.65% | 65.64% | 68.33% |  |
Dividend distributions as percentage of return of capital |  |  |  |  | 37.35% | 27.48% | 31.67% |  |
Dividend distributions as percentage of capital gain |  |  |  |  | 0.00% | 2.59% | 0.00% |  |
Dividend distributions as percentage of unrecaptured Section 1250 gain |  |  |  |  | 0.00% | 4.29% | 0.00% |  |
Common shares issued in public offering | 11,500,000 | 13,800,000 | 9,200,000 | 11,500,000 |  |  |  |  |
Net proceeds from issuance of common shares issued in public offering | $ 262,068 | $ 287,052 | $ 184,735 | $ 247,498 | $ 287,052 | $ 432,233 | $ 281,986 |  |

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