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Capital (Details) - Jun. 30, 2015 - shares
Total
Shares and Units [Abstract]  
OP units outstanding (shares) 267,586,424
OP units owned by the Company (shares) 114,253,886
OP units owned by the Company, percent 42.70%
OP units not owned by the Company (shares) 153,332,538
OP units not owned by the Company, percent 57.30%