XML 22 R46.htm IDEA: XBRL DOCUMENT v2.4.0.8
Common Shares (Narrative) (Details) (USD $)
 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2012
Jan. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
May 31, 2011
2010 and 2011 ATM Programs [Member]
Mar. 31, 2010
2010 and 2011 ATM Programs [Member]
Dec. 31, 2012
2010 and 2011 ATM Programs [Member]
Dec. 31, 2011
2010 and 2011 ATM Programs [Member]
May 31, 2012
2012 ATM Program [Member]
Dec. 31, 2013
2012 ATM Program [Member]
Dec. 31, 2012
2012 ATM Program [Member]
Feb. 21, 2014
2012 ATM Program [Member]
Dec. 31, 2013
Line of Credit [Member]
Maximum aggregate offering price of common shares           $ 300,000,000 $ 250,000,000     $ 300,000,000        
Amount of current borrowing capacity under unsecured credit facility                           500,000,000
Total net consideration     40,044,000 693,355,000 106,571,000     128,128,000 106,570,600   40,044,100 173,607,500    
Common shares sold     555 11,192 1,751     1,971,400 1,751,000   555,100 2,607,900    
Average price per common share sold               $ 66.01 $ 61.95   $ 73.73 $ 67.63    
Maximum aggregate offering price of remaining common shares available for sale                         $ 82,700,000  
Percentage of voting interests acquired 50.00% 80.00%   50.00%                    
Number of unconsolidated equity method investments acquired 1                          
Number of apartment units in wholly owned property acquired 320 4,034 1,118 2,114                    
Number of common and preferred stock authorized to issue     185,000,000                      
Common shares, authorized 175,000,000   175,000,000 175,000,000                    
Preferred shares, authorized     10,000,000                      
Common Stock, Shares, Outstanding     85,300,000