Goodwill and Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2018

Goodwill And Intangible Assets Disclosure [Abstract]

The changes in the carrying amount of goodwill and accumulated impairment loss during the nine months ended September 30, 2018 and year ended December 31, 2017 were as follows:

	Nine Months Ended September 30, 2018									Twelve Months Ended December 31, 2017
	Gross Carrying Amount			Accumulated Impairment Loss			Net			Gross Carrying Amount			Accumulated Impairment Loss			Net
Beginning balance at January 1	$	735,323		$	(144,276	)	$	591,047		$	727,999		$	(139,414	)	$	588,585
Sale of business⁽¹⁾		—			—			—			(3,115	)		—			(3,115	)
Impairment loss⁽²⁾		—			—			—			—			(4,862	)		(4,862	)
Foreign currency translation		(3,186	)		—			(3,186	)		10,439			—			10,439
Ending balance at September 30, 2018 and December 31, 2017	$	732,137		$	(144,276	)	$	587,861		$	735,323		$	(144,276	)	$	591,047

⁽¹⁾

In 2017, the Company sold its Data Analytics Solutions business and, as a result, charged the related goodwill of $(3,115) to the gain on sale of business.

⁽²⁾

In 2017, the Company recorded an impairment loss of $(4,862) related to the write-off of goodwill related to the discontinuation of a product line and consolidation of two manufacturing plants.

Intangible Assets

Components of the Company’s intangible assets are comprised of the following:

As of September 30, 2018:	Gross		Impairment Charges⁽¹⁾			Accumulated Amortization			Foreign Currency Translation			Net
Completed technology	$	172,431	$	(105	)	$	(131,840	)	$	—		$	40,486
Customer relationships		282,744		(1,406	)		(59,260	)		174			222,252
Patents, trademarks, trade names and other		110,523		—			(41,970	)		(3	)		68,550
	$	565,698	$	(1,511	)	$	(233,070	)	$	171		$	331,288

As of December 31, 2017:	Gross		Impairment Charges⁽¹⁾			Accumulated Amortization			Foreign Currency Translation			Net
Completed technology	$	172,431	$	(105	)	$	(115,371	)	$	333		$	57,288
Customer relationships		282,744		(1,406	)		(45,518	)		1,571			237,391
Patents, trademarks, trade names and other		110,523		—			(38,730	)		(74	)		71,719
	$	565,698	$	(1,511	)	$	(199,619	)	$	1,830		$	366,398

⁽¹⁾

In 2017, the Company recorded impairment charges of $1,511 related to the write-off of intangible assets as a result of the discontinuation of a product line and consolidation of two manufacturing plants.

Estimated Net Amortization Expense

Aggregate net amortization expense related to acquired intangible assets and unfavorable lease commitments for future years is as follows:

Year	Amount
2018 (remaining)	$	10,760
2019	$	40,144
2020	$	28,125
2021	$	20,248
2022	$	17,619
2023	$	17,253
Thereafter	$	138,955