Investments In Unconsolidated Joint Ventures (Summary Of Financial Position Of Unconsolidated Joint Ventures) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Investments In Unconsolidated Joint Ventures [Abstract]
Rental property, net	$ 442,346	$ 179,824
Loan receivable	42,953	42,276
Other assets	351,312	311,846
Total assets	836,611	533,946
Mortgages and loans payable	344,095	168,908
Other liabilities	13,115	12,203
Partners'/members' capital (deficit)	479,401	352,835
Total liabilities and partners'/members' capital	$ 836,611	$ 533,946