Other Assets and Accounts Payable and Other Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Schedule of other assets
Prepaid expenses	$ 3,052	$ 3,819
Security deposits	2,506	2,541
Miscellaneous other assets	555	97
Cost method investment	250	250
Furniture, equipment and leasehold improvements, net	2,682	3,373
Intangible assets	538	538
Equity method affiliates	2,390	6,076
Other assets	$ 11,973	$ 16,694