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Organization (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
1 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Feb. 28, 2009
CWH
Apr. 24, 2009
CWH
subsidiary
Feb. 17, 2009
CWH
Related Party Transaction          
Common shares of beneficial interest issued     9.95    
Common shares of beneficial interest, par value (in dollars per share) $ 0.01 $ 0.01     $ 0.01
Percentage of ownership of Initial Properties acquired by means of contribution from CWH to one of the Company's subsidiaries       100.00%  
Number of subsidiaries receiving a contribution from CWH       1