Investments In Unconsolidated Joint Ventures (Summary Of Financial Position Of Unconsolidated Joint Ventures) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Investments In Unconsolidated Joint Ventures [Abstract]
Rental property, net	$ 1,736,842	$ 1,781,621
Other assets	294,444	307,000
Total assets	2,031,286	2,088,621
Mortgages and loans payable	1,279,688	1,298,293
Other liabilities	215,552	215,951
Partners'/members' capital	536,046	574,377
Total liabilities and partners'/members' capital	$ 2,031,286	$ 2,088,621