The Company’s finite and indefinite-lived intangible assets consist of the following:

	June 30, 2019					December 31, 2018
	Gross Carrying Amount		Accumulated Amortization			Gross Carrying Amount		Accumulated Amortization
Finite-lived intangible assets
Patents	$	4,806	$	(4,806	)	$	4,806	$	(4,788	)
Land use rights		1,134		(203	)		1,134		(203	)
Trademarks		1,712		(1,297	)		1,707		(1,247	)
Technology		5,387		(1,439	)		2,994		(1,334	)
Customer relationships		14,340		(6,775	)		11,804		(6,415	)
	$	27,379	$	(14,520	)	$	22,445	$	(13,987	)
Indefinite-lived intangible assets
Goodwill	$	28,726				$	15,621

The aggregate amortization expense for other intangibles with finite lives for the three and six months ended June 30, 2019 was $.3 million and $.6 million, respectively. The aggregate amortization expense for other intangibles with finite lives for the three and six months ended June 30, 2018 was $.3 million and $.5 million, respectively. Amortization expense is estimated to be $1.1 million for the remaining period of 2019, $1.2 million for 2020 and 2021, and $1.1 million for and 2022 and 2023. The weighted-average remaining amortization period is approximately 15.3 years. The weighted-average remaining amortization period by intangible asset class is as follows: patents, 6.5 years; land use rights, 56.5 years; trademarks, 8.1 years; technology, 13.6 years; and customer relationships, 12.0 years.

The Company’s measurement date for its annual impairment test for goodwill is October 1st of each year. The Company performs its annual impairment test for goodwill utilizing a discounted cash flow methodology, market comparables, and an overall market capitalization reasonableness test in computing fair value by reporting unit. The Company then compares the fair value of the reporting unit with its carrying value to assess if goodwill has been impaired. Based on the assumptions as to growth, discount rates and the weighting used for each respective valuation methodology, results of the valuations could be significantly different. However, the Company believes that the methodologies and weightings used are reasonable and result in appropriate fair values of the reporting units. The Company’s valuation method uses Level 3 inputs under the fair value hierarchy.

The Company’s only intangible asset with an indefinite life is goodwill. The changes in the carrying amount of goodwill, by segment, for the six months ended June 30, 2019 are as follows:

	USA		The Americas		EMEA			Asia-Pacific			Total
Balance at January 1, 2019	$	3,078	$	3,997	$	1,355		$	7,191		$	15,621
Currency translation		0		135		(151	)		(71	)		(87	)
Additions						13,192						13,192
Balance at June 30, 2019	$	3,078	$	4,132	$	14,396		$	7,120		$	28,726

Refer to Note S, “Business Combinations” for further information regarding additions.