Debt and Preferred Equity Investments (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Jun. 30, 2013
Rollforward of the entity's total loan loss reserves
Balance at beginning of year	$ 50,175	$ 7,000
Expensed	3,000
Recoveries	(2,436)
Charge-offs and reclassifications	(43,739)
Balance at end of period	$ 7,000	$ 7,000