Fair Value of Financial Instruments (Tables)

6 Months Ended

Jul. 02, 2011

Fair Value Disclosures [Abstract]

Schedule Of Fair Value Assets And Liabilities Measured On Recurring Basis Table [Text Block]

							Fair Value Measurements as of
	Carrying Amount		Total Fair Value				July 2, 2011
					Cash		Level 1		Level 2		Level 3
Measured on a recurring basis:
Assets:
Cash	$	19,214	$	19,214	$	19,214	$	—	$	—	$	—
Cash equivalents	117,031		117,031		—		82,434		34,597		—
Short-term—marketable securities	44,610		44,610		—		4,419		40,191		—
Non-qualified deferred compensation plan	3,677		3,677		—		3,677		—		—
Total	$	184,532	$	184,532	$	19,214	$	90,530	$	74,788	$	—
Liabilities:
Earnout payment liability	$	747	$	747	$	—	$	—	$	—	$	747
Non-qualified deferred compensation plan	3,677		3,677		—		3,677		—		—
Total	$	4,424	$	4,424	$	—	$	3,677	$	—	$	747
							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	63
Change in estimate	(681		)
Ending earnout payment liability at July 2, 2011	$	747