Goodwill and Identified Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in Carrying Amount of Goodwill

(in thousands):

	Video			Cable Edge			Total
Balance as of December 31, 2014	$	136,975		$	60,909		$	197,884
Foreign currency translation adjustment	(71		)	(32		)	(103		)
Balance as of December 31, 2015	$	136,904		$	60,877		$	197,781

Summary of Identified Intangible Assets

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

		December 31, 2015							December 31, 2014
	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	$	10,987	$	(10,987	)	$	—	$	136,145	$	(135,426	)	$	719
Customer relationships/contracts	5-6 years	29,200		(25,752		)	3,448		67,098		(58,784		)	8,314
Trademarks and tradenames	4-5 years	—		—			—		11,361		(11,361		)	—
Maintenance agreements and related relationships	6-7 years	5,500		(4,851		)	649		7,100		(5,534		)	1,566
Total identifiable intangibles		$	45,687	$	(41,590	)	$	4,097	$	221,704	$	(211,105	)	$	10,599

Purchased Intangibles Amortization Expense Allocation

Amortization expense for the identifiable purchased intangible assets for the years ended December 31, 2015, 2014 and 2013 was allocated as follows (in thousands):

	December 31,
	2015		2014		2013
Included in cost of revenue	$	719	$	13,745	$	19,233
Included in operating expenses	5,783		6,775		8,096
Total amortization expense	$	6,502	$	20,520	$	27,329