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Real Estate (Allowance for doubtful accounts) (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Real Estate Tenant Receivables    
Schedule of Operating Lease Allowance for Doubtful Accounts [Line Items]    
Allowance for doubtful accounts receivable $ 2.2 $ 1.9
Deferred Operating Lease    
Schedule of Operating Lease Allowance for Doubtful Accounts [Line Items]    
Allowance for doubtful accounts receivable $ 1.5 $ 1.5