Investment in Unconsolidated Joint Ventures (Summary Of Financial Information For Joint Ventures) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Equity Method Investments and Joint Ventures [Abstract]
Net Investment in Properties	$ 752,641		$ 758,582
Total Assets	929,309		935,990
Debt	459,622		460,023
Total Liabilities	556,685		558,310
Equity	372,624		377,679
Our investment in and share of equity in earnings of unconsolidated joint ventures	106,008		$ 106,107
Revenues	33,080	$ 31,850
Property Operating Expense	(9,652)	(8,175)
Net Operating Income	23,428	23,675
Net Income	9,618	10,026
Investment in and share of net income (loss)	$ 4,078	$ 4,618