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Variable Interest Entities (Summary Of Unconsolidated Variable Interest Entities) (Details) - Unconsolidated Variable Interest Entities [Member]
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
joint_venture
Dec. 31, 2016
USD ($)
joint_venture
Variable Interest Entity [Line Items]    
Investment in real estate joint ventures and partnerships, net $ 1,084 $ 886
Number of joint venture arrangements | joint_venture 1 1
Maximum risk of loss $ 34,000 $ 34,000
Number of VIE real estate joint ventures | joint_venture 2 2
Other Liabilities [Member]    
Variable Interest Entity [Line Items]    
Investment in real estate joint ventures and partnerships, net $ (8,000) $ (8,695)