Goodwill and Identified Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

The changes in the carrying amount of goodwill for the years ended December 31, 2014 and 2013 are as follows (in

thousands):




Balance as of December 31, 2012	$	212,518
Reduction in goodwill associated with the sale of the cable access HFC Business	(14,547		)
Foreign currency translation adjustment	51
Balance as of December 31, 2013	198,022
Foreign currency translation adjustment	(138		)
Balance as of December 31, 2014	$	197,884

Summary of Identified Intangible Assets

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



		December 31, 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	$	(135,426	)	$	719	$	136,145	$	(121,681	)	$	14,464
Customer relationships/contracts	5-6 years	67,098		(58,784		)	8,314		67,098		(53,772		)	13,326
Trademarks and tradenames	4-5 years	11,361		(11,361		)	—		11,361		(10,565		)	796
Maintenance agreements and related relationships	6-7 years	7,100		(5,534		)	1,566		7,100		(4,567		)	2,533
Total identifiable intangibles		$	221,704	$	(211,105	)	$	10,599	$	221,704	$	(190,585	)	$	31,119

Purchased Intangibles Amortization Expense Allocation

Amortization expense for the identifiable purchased intangible assets for the years ended December 31, 2014, 2013 and 2012 was allocated as follows (in thousands):



	December 31,
	2014		2013		2012
Included in cost of revenue	$	13,745	$	19,233	$	20,499
Included in operating expenses	6,775		8,096		8,705
Total amortization expense	$	20,520	$	27,329	$	29,204

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,
2015	$	719	$	5,783	$	6,502
2016	—		4,097		4,097
2017	—		—		—
2018	—		—		—
2019	—		—		—
Total future amortization expense	$	719	$	9,880	$	10,599