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 |