NOTES RECEIVABLE AND PREFERRED EQUITY INVESTMENT Schedule of Allowance for Credit Losses on Notes Receivable (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	$ 3,276	$ 3,036
Change in allowance, net	405	240	93
Balance at end of period	$ 3,681	$ 3,276	$ 3,036