Investments In Unconsolidated Joint Ventures (Summary Of Financial Position Of Unconsolidated Joint Ventures) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Investments In Unconsolidated Joint Ventures [Abstract]
Rental property, net	$ 1,598,623	$ 1,781,621
Other assets	269,073	307,000
Total assets	1,867,696	2,088,621
Mortgages and loans payable	1,187,866	1,298,293
Other liabilities	229,941	215,951
Partners'/members' capital	449,889	574,377
Total liabilities and partners'/members' capital	$ 1,867,696	$ 2,088,621