Goodwill and Identified Intangible Assets (Tables)

6 Months Ended

Jun. 27, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

The changes in the carrying amount of goodwill for the six months ended June 27, 2014 are as follows (in thousands):



Balance at beginning of period	$	198,022
Foreign currency translation adjustment	77
Balance at end of period	$	198,099

Summary of Goodwill and Identified Intangible Assets

The following is a summary of identified intangible assets (in thousands):



		June 27, 2014							December 31, 2013
	Range of Useful Lives	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Identifiable intangibles:
Developed core technology	4-6 years	$	136,145	$	(130,880	)	$	5,265	$	136,145	$	(121,681	)	$	14,464
Customer relationships/contracts	5-6 years	67,098		(56,351		)	10,747		67,098		(53,772		)	13,326
Trademarks and tradenames	4-5 years	11,361		(11,152		)	209		11,361		(10,565		)	796
Maintenance agreements and related relationships	6-7 years	7,100		(5,069		)	2,031		7,100		(4,567		)	2,533
Total identifiable intangibles		$	221,704	$	(203,452	)	$	18,252	$	221,704	$	(190,585	)	$	31,119

Amortization Expense for Identifiable Purchased Intangible Assets

Amortization expense for the identifiable purchased intangible assets for the three and six months ended June 27, 2014 and June 28, 2013 was allocated as follows (in thousands):



	Three months ended				Six months ended
	June 27, 2014		June 28, 2013		June 27, 2014		June 28, 2013
Included in cost of revenue	$	4,482	$	4,762	$	9,198	$	9,707
Included in operating expenses	1,718		2,010		3,668		4,098
Total amortization expense	$	6,200	$	6,772	$	12,866	$	13,805

Estimated Future Amortization Expense of Purchased Intangible Assets

The estimated future amortization expense of purchased intangible assets with definite lives is as follows (in thousands):



	Cost of Revenue		Operating Expenses		Total
Year ended December 31,
2014 (remaining 6 months)	$	4,546	$	3,107	$	7,653
2015	719		5,783		6,502
2016	—		4,097		4,097
2017	—		—		—
2018	—		—		—
Total future amortization expense	$	5,265	$	12,987	$	18,252