Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2012

Fair Value Measurements

Fair value measurements for assets and liabilities measured on a recurring basis

March 31, 2012	Total		Level 1		Level 2		Level 3
Assets
Cash and cash equivalents:
Tax free money market mutual funds	$	4,532	$	4,532	$	—	$	—
U.S. government money market mutual funds	113,152		113,152		—		—
Money market mutual funds	2,645		2,645		—		—
Securities owned, at fair value:
Corporate stocks-trading securities	1,362		1,362		—		—
Mutual funds	5,023		5,023		—		—
Other assets
Currency forward contracts	5		—		5		—
Total	$	126,719	$	126,714	$	5	$	—
Liabilities
Securities sold, not yet purchased, at fair value:
Corporate stocks-trading securities	$	1,507	$	1,507	$	—	$	—
Total	$	1,507	$	1,507	$	—	$	—

December 31, 2011	Total		Level 1		Level 2		Level 3
Assets
Cash and cash equivalents:
Tax free money market mutual funds	$	2,041	$	2,041	$	—	$	—
U.S. government money market mutual funds	110,901		110,901		—		—
Money market mutual funds	6,372		6,372		—		—
Securities owned, at fair value:
Corporate stocks-trading securities	689		689		—		—
Mutual funds	4,588		4,588		—		—
Total	$	124,591	$	124,591	$	—	$	—
Liabilities
Accounts payable and accrued expenses:
Currency forward contracts	$	3	$	—	$	3	$	—
Securities sold, not yet purchased, at fair value:
Corporate stocks—trading securities	438		438		—		—
Total	$	441	$	438	$	3	$	—