Loans Receivable (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Activity related to loans receivable
Balance at beginning of period			$ 114,333
Purchase and advances			64,970	44,512
Interest (received) accrued, net			293
Repayments			(37,126)	(43,410)
Accretion of loan discount	425	2,374	5,984	11,167
Discount accretion received in cash			(14,065)	(13,290)
Conversion of 180 North Michigan loan to equity investments			(2,938)
Balance at end of period	$ 138,001		$ 138,001