Goodwill and Identified Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2013

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Identified Intangible Assets

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

		December 31, 2013							December 31, 2012
	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	$	(121,681	)	$	14,464	$	136,145	$	(102,449	)	$	33,696
Customer relationships/contracts	5-6 years	67,098		(53,772		)	13,326		67,098		(48,150		)	18,948
Trademarks and tradenames	4-5 years	11,361		(10,565		)	796		11,361		(9,145		)	2,216
Maintenance agreements and related relationships	6-7 years	7,100		(4,567		)	2,533		7,100		(3,513		)	3,587
Total identifiable intangibles		$	221,704	$	(190,585	)	$	31,119	$	221,704	$	(163,257	)	$	58,447

Changes in Carrying Amount of Goodwill

The changes in the carrying amount of goodwill for the years ended December 31, 2013 and 2012 are as follows (in thousands):

	December 31,
	2013			2012
Balance at beginning of period	$	212,518		$	212,417
Reduction in goodwill associated with the sale of the cable access HFC Business	(14,547		)	—
Foreign currency translation adjustment	51			101
Balance at end of period	$	198,022		$	212,518

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	$	13,745	$	6,775	$	20,520
2015	719		5,783		6,502
2016	—		4,097		4,097
2017	—		—		—
2018	—		—		—
Total future amortization expense	$	14,464	$	16,655	$	31,119