Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2011

Goodwill and Other Intangible Assets

Summary of goodwill activity

	Year Ended
	December 31, 2011			January 1, 2011
Beginning balance	$	112,296		$	105,109
Additions due to business combinations		4,097			7,187
Adjustments		(904	)		—
Ending balance	$	115,489		$	112,296

Schedule of gross carrying amount and accumulated amortization of other intangible assets

		December 31, 2011					January 1, 2011
	Weighted-Average Amortization Period (Years)	Gross Amount		Accumulated Amortization			Gross Amount		Accumulated Amortization
Intangible assets:
Subject to amortization:
Core and developed technology	9.4	$	79,500	$	(30,432	)	$	64,270	$	(22,383	)
Customer relationships	9.9		2,510		(523	)		3,410		(1,766	)
Patents	—		—		—			2,898		(2,657	)
	9.4		82,010		(30,955	)		70,578		(26,806	)
Not subject to amortization:
In-process research and development	Not amortized		8,950		—			9,470		—
Total intangible assets		$	90,960	$	(30,955	)	$	80,048	$	(26,806	)

Schedule of estimated aggregate amortization expense for intangible assets subject to amortization for each of the five succeeding fiscal years

Fiscal Year
2012	$	9,056
2013		7,680
2014		6,840
2015		6,448
2016		5,716