Fair Value of Financial Instruments (Tables)

9 Months Ended

Oct. 01, 2011

Fair Value Disclosures [Abstract]

Schedule Of Fair Value Assets And Liabilities Measured On Recurring Basis Table

							Fair Value Measurements as of
	Carrying Amount		Total Fair Value				October 1, 2011
					Cash		Level 1		Level 2		Level 3
Measured on a recurring basis:
Assets:
Cash	$	22,579	$	22,579	$	22,579	$	—	$	—	$	—
Cash equivalents	91,101		91,101		—		50,930		40,171		—
Short-term—marketable securities	33,544		33,544		—		6,232		27,312		—
Non-qualified deferred compensation plan	3,281		3,281		—		3,281		—		—
Total	$	150,505	$	150,505	$	22,579	$	60,443	$	67,483	$	—
Liabilities:
Earnout payment liability	$	769	$	769	$	—	$	—	$	—	$	769
Non-qualified deferred compensation plan	3,281		3,281		—		3,281		—		—
Total	$	4,050	$	4,050	$	—	$	3,281	$	—	$	769
							Fair Value Measurements as of
	Carrying Amount		Total Fair Value				December 31, 2010
					Cash		Level 1		Level 2		Level 3
Measured on a recurring basis:
Assets:
Cash	$	72,422	$	72,422	$	72,422	$	—	$	—	$	—
Cash equivalents	120,042		120,042		—		120,042		—		—
Short-term—marketable securities	31,192		31,192		—		4,822		26,370		—
Non-qualified deferred compensation plan	2,971		2,971		—		2,971		—		—
Total	$	226,627	$	226,627	$	72,422	$	127,835	$	26,370	$	—
Liabilities:
Earnout payment liability	$	1,365	$	1,365	$	—	$	—	$	—	$	1,365
Non-qualified deferred compensation plan	2,971		2,971		—		2,971		—		—
Total	$	4,336	$	4,336	$	—	$	2,971	$	—	$	1,365

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation

Ending earnout payment liability at December 31, 2010	$	1,365
Accretion	85
Change in estimate	(681		)
Ending earnout payment liability at October 1, 2011	$	769