Debt and Preferred Equity Investments (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Loan loss reserve activity
Balance at beginning of year	$ 7,000	$ 50,175	$ 61,361
Expensed	0	3,000	10,875
Recoveries	0	(2,436)	(4,370)
Charge-offs and reclassifications	(6,000)	(43,739)	(17,691)
Balance at end of period	$ 1,000	$ 7,000	$ 50,175