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Real Estate (Tenant Reimbursements) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Operating Lease Income        
Real Estate Properties [Line Items]        
Tenant reimbursements $ 5.0 $ 5.2 $ 10.6 $ 10.7