Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2012

Fair Value Disclosures [Abstract]

Schedule of assets and liabilities measured at fair value on recurring basis

The following tables present financial assets and liabilities at September 30, 2012 and December 31, 2011 for which the Company measures fair value on a recurring basis, by level, within the fair value hierarchy:

September 30, 2012	Total		Level 1		Level 2		Level 3		Valuation Technique
Assets
Money market mutual funds	$	11,027	$	11,027	$	—	$	—	(a)
Government agency bonds	4,077		4,077		—		—		(a)
Corporate notes	4,004		4,004		—		—		(a)
United States treasuries	3,687		3,687		—		—		(a)
Certificates of deposit	1,501		1,501		—		—		(a)
Liabilities
Interest rate swaps	$	568	$	—	$	568	$	—	(d)

December 31, 2011	Total		Level 1		Level 2		Level 3		Valuation Technique
Assets
Government agency bonds	$	9,015	$	9,015	$	—	$	—	(a)
Money market mutual funds	8,818		8,818		—		—		(a)
Corporate notes	3,019		3,019		—		—		(a)
Certificates of deposit	2,701		2,701		—		—		(a)
Liabilities
Interest rate swaps	$	510	$	—	$	510	$	—	(d)