9)	Goodwill and Intangible Assets

Goodwill

The Company’s methodology for allocating the purchase price relating to purchase acquisitions is determined through established and generally accepted valuation techniques. Goodwill is measured as the excess of the cost of the acquisition over the sum of the amounts assigned to tangible and identifiable intangible assets acquired less liabilities assumed. The Company assigns assets acquired (including goodwill) and liabilities assumed to one or more reporting units as of the date of acquisition. Typically acquisitions relate to a single reporting unit and thus do not require the allocation of goodwill to multiple reporting units. If the products obtained in an acquisition are assigned to multiple reporting units, the goodwill is distributed to the respective reporting units as part of the purchase price allocation process.

Goodwill and purchased intangible assets with indefinite useful lives are not amortized, but are reviewed for impairment annually during the fourth quarter of each fiscal year and whenever events or changes in circumstances indicate that the carrying value of an asset may not be recoverable. The process of evaluating the potential impairment of goodwill and intangible assets requires significant judgment. The Company regularly monitors current business conditions and other factors including, but not limited to, adverse industry or economic trends, restructuring actions and lower projections of profitability that may impact future operating results.

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


	Six Months Ended June 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		(2,329	)		—			(2,329	)		10,439			—			10,439

Ending balance at June 30, 2018 and December 31, 2017	$	732,994		$	(144,276	)	$	588,718		$	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 June 30, 2018:	Gross		Impairment Charges⁽¹⁾			Accumulated Amortization			Foreign Currency Translation		Net
Completed technology	$	172,431	$	(105	)	$	(126,383	)	$	26	$	45,969
Customer relationships		282,744		(1,406	)		(54,712	)		550		227,176
Patents, trademarks, trade names and other		110,523		—			(40,985	)		1		69,539

	$	565,698	$	(1,511	)	$	(222,080	)	$	577	$	342,684


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.

Aggregate amortization expense related to acquired intangibles for the six months ended June 30, 2018 and 2017 was $22,091 and $23,969, respectively. The amortization expense for the six months ended June 30, 2018 and 2017 is net of $370 and $366, respectively, of amortization income from unfavorable lease commitments. Aggregate net amortization expense related to acquired intangible assets and unfavorable lease commitments for future years is as follows:


Year	Amount
2018 (remaining)	$	21,475
2019		40,182
2020		28,152
2021		20,272
2022		17,645
2023		17,280
Thereafter		139,195