Investments In Unconsolidated Joint Ventures (Summary Of Financial Position Of Unconsolidated Joint Ventures) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Investments In Unconsolidated Joint Ventures [Abstract]
Rental property, net	$ 1,546,589	$ 1,534,812
Other assets	410,410	398,222
Total assets	1,956,999	1,933,034
Mortgages and loans payable	1,162,732	1,060,020
Other liabilities	214,572	211,340
Partners'/members' capital	579,695	661,674
Total liabilities and partners'/members' capital	$ 1,956,999	$ 1,933,034