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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