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Real Estate (Tenant Reimbursements) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Real Estate [Abstract]        
Tenant reimbursements $ 6.8 $ 7.6 $ 20.4 $ 23.1