v2.4.0.6
Segment Information (Details 3) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Revenue                      
Total revenues $ 660,711 [1] $ 641,520 [1] $ 614,502 [1] $ 568,566 [1] $ 563,145 [2] $ 554,691 [2] $ 359,421 [2] $ 266,396 [2] $ 2,485,299 $ 1,743,653 $ 1,000,634
Net real estate property:                      
Net real estate property 17,111,532       15,913,732       17,111,532 15,913,732  
United States
                      
Revenue                      
Total revenues                 2,389,330 1,651,614 916,104
Net real estate property:                      
Net real estate property 16,711,508       15,510,824       16,711,508 15,510,824  
Canada
                      
Revenue                      
Total revenues                 95,969 92,039 84,530
Net real estate property:                      
Net real estate property $ 400,024       $ 402,908       $ 400,024 $ 402,908  
[1] The amounts presented for the three months ended March 31, 2012, June 30, 2012 and September 30, 2012 differ from the amounts previously reported in our Quarterly Reports on Form 10-Q as a result of discontinued operations consisting of properties sold in 2012 or classified as held for sale as of December 31, 2012.
[2] The amounts presented for the three months ended March 31, 2011, June 30, 2011, September 30, 2011 and December 31, 2011 differ from the amounts previously reported in our Annual Report on Form 10-K for the year ended December 31, 2011 as a result of discontinued operations consisting of properties sold in 2012 or classified as held for sale as of December 31, 2012.