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Capital (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Mar. 31, 2014
Jun. 30, 2014
Shares and Units [Abstract]      
OP units outstanding (shares) 245,964,043   245,964,043
OP units owned by the Company (shares) 95,607,990   95,607,990
OP units owned by the Company, percent     38.90%
OP units not owned by the Company (shares) 150,356,053   150,356,053
OP units not owned by the Company, percent     61.10%
Dividends and Distributions [Abstract]      
Partial dividend paid, per OP unit $ 0.085 $ 0.085  
Distributions paid to OP unit holders     $ 41.8