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Capital (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Shares and Units [Abstract]    
OP units outstanding (shares) 245,894,321  
OP units owned by the Company (shares) 95,618,664  
OP units owned by the Company, percent 38.90%  
OP units not owned by the Company (shares) 150,275,657  
OP units not owned by the Company, percent 61.10%  
Dividends and Distributions [Abstract]    
Partial dividend paid, per OP unit   $ 0.085
Distributions paid to OP unit holders $ 20.9