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Summary Of Significant Accounting Policies (Variable Interest Entities) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Variable Interest Entity [Line Items]    
Number of consolidated variable interest entities 17  
Net real estate assets of consolidated VIEs $ 1,400,000 $ 1,000,000
Mortgage Payable From Consolidated Variable Interest Entities 460,372 439,120
Unconsolidated variable interest entities    
Variable Interest Entity [Line Items]    
Maximum exposure to loss in variable interest entity $ 23,900 $ 13,500