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Capital (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Mar. 31, 2014
Sep. 30, 2014
Shares and Units [Abstract]      
OP units outstanding (shares) 267,129,680   267,129,680
OP units owned by the Company (shares) 98,267,542   98,267,542
OP units owned by the Company, percent     36.80%
OP units not owned by the Company (shares) 168,862,138   168,862,138
OP units not owned by the Company, percent     63.20%
Dividends and Distributions [Abstract]      
Partial dividend paid, per OP unit $ 0.085 $ 0.085  
Distributions paid to OP unit holders     $ 64.5