Investments in Unconsolidated Joint Ventures (Summary Of Financial Information For Joint Ventures) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Equity Method Investments and Joint Ventures [Abstract]
Net Investment in Properties			$ 1,038,172		$ 1,061,950
Total Assets	$ 1,338,870		1,338,870		1,375,006
Debt	717,024		717,024		712,690
Total Liabilities	830,944		830,944		869,879
Equity	507,926		507,926		505,127
Our investment in and share of equity in earnings of unconsolidated joint ventures	167,306		167,306		$ 163,477
Revenues			105,759	$ 71,072
Property Operating Expense			(38,786)	(21,969)
Net Operating Income			66,973	49,103
Net Income			29,897	20,615
Investment in and share of net income (loss)	$ 7,438	$ 8,388	$ 14,848	$ 13,712