Goodwill represents the excess of the cost over the net tangible and identifiable intangible assets of acquired businesses. Identifiable intangible assets acquired in business combinations are recorded based upon fair value at the date of acquisition.

	Year Ended June 30, 2019
	II-VI Laser			II-VI			II- VI Performance
	Solutions			Photonics			Products		Total
Balance-beginning of period	$	98,737		$	109,670		$	62,271	$	270,678
Goodwill acquired		-			26,069			25,569		51,638
Foreign currency translation		(856	)		(1,682	)		-		(2,538	)
Balance-end of period	$	97,881		$	134,057		$	87,840	$	319,778

	Year Ended June 30, 2018
	II-VI Laser		II-VI		II- VI Performance
	Solutions		Photonics		Products		Total
Balance-beginning of period	$	79,527	$	108,544	$	62,271	$	250,342
Goodwill acquired		18,956		-		-		18,956
Goodwill adjustment for prior year acquisition - IPI		-		407		-		407
Foreign currency translation		254		719		-		973
Balance-end of period	$	98,737	$	109,670	$	62,271	$	270,678

The gross carrying amount and accumulated amortization of the Company’s intangible assets other than goodwill as of June 30, 2019 and 2018 were as follows ($000):

	June 30, 2019							June 30, 2018
	Gross					Net		Gross					Net
	Carrying		Accumulated			Book		Carrying		Accumulated			Book
	Amount		Amortization			Value		Amount		Amortization			Value
Technology and Patents	$	91,637	$	(39,679	)	$	51,958	$	66,812	$	(32,979	)	$	33,833
Trade Names		15,759		(1,601	)		14,158		15,882		(1,471	)		14,411
Customer Lists		132,872		(59,664	)		73,208		127,603		(50,792	)		76,811
Other		1,572		(1,572	)		-		1,573		(1,559	)		14
Total	$	241,840	$	(102,516	)	$	139,324	$	211,870	$	(86,801	)	$	125,069

Amortization expense recorded on the intangible assets for the fiscal years ended June 30, 2019, 2018 and 2017 was $16.6 million, $14.6 million, and $12.7 million, respectively. The technology and patents are being amortized over a range of 60 to 240 months with a weighted-average remaining life of approximately 84 months. The customer lists are being amortized over 60 to 240 months with a weighted-average remaining life of approximately 130 months.

In conjunction with the acquisition of CoAdna, the Company recorded $9.8 million attributed to the value of technology and patents and $6.3 million of customer lists. The intangibles were recorded based on the Company’s purchase price allocation utilizing either the multi-period excess earnings method or relief from royalty method to derive the fair value.

In conjunction with the acquisition of the product line, the Company recorded $6.3 million of acquired technology. The acquired technology was recorded based on the Company’s purchase price allocation utilizing a relief from royalty method to derive the fair value.

In conjunction with the acquisition of Redstone, the Company recorded $9.1 million of acquired technology. The acquired technology was recorded based on the Company’s purchase price allocation utilizing a relief from royalty method to derive the fair value.

In connection with past acquisitions, the Company acquired trade names with indefinite lives. The carrying amount of these trade names of $14.0 million as of June 30, 2019 is not amortized but tested annually for impairment. The Company completed its impairment test of these trade names with indefinite lives in the fourth quarter of fiscal years 2019 and 2018. Based on the results of these tests, the trade names were not impaired in fiscal years 2019 and 2018.

The estimated amortization expense for existing intangible assets for each of the five succeeding years is as follows ($000):