Goodwill and Intangible Assets (Tables)

6 Months Ended

Jun. 28, 2019

The following table summarizes changes in goodwill during the six months ended June 28, 2019 (in thousands):

Balance at beginning of the period	$	217,662
Goodwill acquired from acquisitions		13,394
Effect of foreign exchange rate changes		(685	)
Balance at end of the period	$	230,371

Goodwill by reportable segment as of June 28, 2019 was as follows (in thousands):

	Reportable Segment
	Photonics			Vision			Precision Motion			Total
Goodwill	$	168,698		$	160,661		$	52,241		$	381,600
Accumulated impairment of goodwill		(102,461	)		(31,722	)		(17,046	)		(151,229	)
Total	$	66,237		$	128,939		$	35,195		$	230,371

Goodwill by reportable segment as of December 31, 2018 was as follows (in thousands):

	Reportable Segment
	Photonics			Vision			Precision Motion			Total
Goodwill	$	168,955		$	155,017		$	44,919		$	368,891
Accumulated impairment of goodwill		(102,461	)		(31,722	)		(17,046	)		(151,229	)
Total	$	66,494		$	123,295		$	27,873		$	217,662

Intangible assets as of June 28, 2019 and December 31, 2018, respectively, are summarized as follows (in thousands):

	June 28, 2019							December 31, 2018
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Amortizable intangible assets:
Patents and developed technologies	$	145,369	$	(91,250	)	$	54,119	$	134,034	$	(86,623	)	$	47,411
Customer relationships		149,095		(70,733	)		78,362		139,097		(64,174	)		74,923
Customer backlog		1,925		(1,740	)		185		1,738		(1,191	)		547
Non-compete covenant		—		—			—		2,514		(2,493	)		21
Trademarks and trade names		16,509		(9,427	)		7,082		15,915		(8,924	)		6,991
Amortizable intangible assets		312,898		(173,150	)		139,748		293,298		(163,405	)		129,893
Non-amortizable intangible assets:
Trade names		13,027		—			13,027		13,027		—			13,027
Totals	$	325,925	$	(173,150	)	$	152,775	$	306,325	$	(163,405	)	$	142,920

Amortization expense was as follows (in thousands):

	Three Months Ended				Six Months Ended
	June 28,		June 29,		June 28,		June 29,
	2019		2018		2019		2018
Amortization expense – cost of revenue	$	2,446	$	2,489	$	4,757	$	4,969
Amortization expense – operating expenses		3,772		3,893		7,770		7,591
Total amortization expense	$	6,218	$	6,382	$	12,527	$	12,560

Estimated amortization expense for each of the five succeeding years and thereafter as of June 28, 2019 was as follows (in thousands):