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Shareholders' Equity (Details 2) (USD $)
In Thousands, except Share data, unless otherwise specified
 1 Months Ended 12 Months Ended
Oct. 31, 2011
Jul. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Jan. 04, 2012
Distribution declared in January 2012
Distributions              
Distribution to common shareholders (in dollars per share)       $ 1.49 $ 1.45 $ 1.42  
Dividend distributions as percentage of ordinary income       65.64% 68.33% 76.14%  
Dividend distributions as percentage of return of capital       27.48% 31.67% 23.86%  
Dividend distributions as percentage of capital gain       2.59% 0.00% 0.00%  
Dividend distributions as percentage of unrecaptured Section 1250 gain       4.29% 0.00% 0.00%  
Distribution declared to common shareholders (in dollars per share)             $ 0.38
Distribution declared to common shareholders             $ 61,805
Common shares issued in public offering (in shares) 9,200,000 11,500,000 14,400,000        
Net proceeds from issuance of common shares issued in public offering $ 184,735 $ 247,498 $ 281,986 $ 432,233 $ 281,986 $ 223,973