Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

Changes in Carrying Amount of Goodwill

The changes in the carrying amount of goodwill for the three years ended December 31, 2017 are as follows (in thousands):

	CPE			N & C			Enterprise		Total
Goodwill		682,582			710,037			—	$	1,392,619
Accumulated impairment losses		—			(378,656	)		—		(378,656	)
Balance as of December 31, 2015	$	682,582		$	331,381		$	—	$	1,013,963
Changes in year 2016:
Goodwill acquired (disposed), net		698,106			291,331			—		989,437
Currency translation		10,483			(60	)		—		10,423
Other		—			2,346			—		2,346
Balance as of December 31, 2016	$	1,391,171		$	624,998		$	—	$	2,016,169
Goodwill		1,391,171			1,003,654			—		2,394,825
Accumulated impairment losses		—			(378,656	)		—		(378,656	)
Balance as of December 31, 2016	$	1,391,171		$	624,998		$	—	$	2,016,169
Changes in year 2017:
Goodwill acquired, net		—			—			318,034		318,034
Impairment		—			(51,200	)		—		(51,200	)
Other		(4,491	)		—			—		(4,491	)
Balance as of December 31, 2017	$	1,386,680		$	573,798		$	318,034	$	2,278,512
Goodwill		1,386,680			1,003,654			318,034		2,708,368
Accumulated impairment losses		—			(429,856	)		—		(429,856	)
Balance as of December 31, 2017	$	1,386,680		$	573,798		$	318,034	$	2,278,512

Gross Carrying Amount and Accumulated Amortization of Intangible Assets

The gross carrying amount and accumulated amortization of the Company’s intangible assets as of December 31, 2017 and December 31, 2016 are as follows (in thousands):

	December 31, 2017						December 31, 2016
	Gross Amount		Accumulated Amortization		Net Book Value		Gross Amount		Accumulated Amortization		Net Book Value
Definite-lived intangible assets:
Customer relationships	$	1,672,470	$	780,655	$	891,815	$	1,572,947	$	624,719	$	948,228
Developed technology, patents & licenses		1,521,893		771,200		750,693		1,248,719		571,808		676,911
Trademarks, trade and domain names		87,472		41,885		45,587		83,472		41,433		42,039
Backlog		35,000		5,833		29,167		16,400		16,400		—
Sub-total	$	3,316,835	$	1,599,573	$	1,717,262	$	2,921,538	$	1,254,360	$	1,667,178
Indefinite-lived intangible assets:
Trademarks and trade names		—		—		—		5,900		—		5,900
In-process research and development		54,100		—		54,100		4,100		—		4,100
Sub-total		54,100		—		54,100		10,000		—		10,000
Total	$	3,370,935	$	1,599,573	$	1,771,362	$	2,931,538	$	1,254,360	$	1,677,178

Schedule of Amortization of Intangible Assets

The following table presents the amortization of intangible assets (in thousands):

	Years Ended December 31,
	2017		2016		2015
Cost of sales	$	3,174	$	2,963	$	670
Selling, general & administrative expense		3,835		4,048		3,480
Amortization of acquired intangible assets		375,407		397,464		227,440
Total	$	382,416	$	404,475	$	231,590

Estimated Total Amortization Expense for Finite-Lived Intangibles for Next Five Fiscal Years

The estimated total amortization expense for finite-lived intangibles for each of the next five fiscal years is as follows (in thousands):

2018	$	402,005
2019		326,807
2020		315,077
2021		180,290
2022		146,499
Thereafter		344,484