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Capital (Details)
9 Months Ended
Sep. 30, 2015
shares
Shares and Units [Abstract]  
OP units outstanding (shares) 267,579,408
OP units owned by the Company (shares) 117,954,034
OP units owned by the Company, percent 44.10%
OP units not owned by the Company (shares) 149,625,374
OP units not owned by the Company, percent 55.90%