Goodwill and Other Intangible Assets

We evaluate finite-lived intangible assets for impairment if indicators of impairment exist. No indicators were identified for the years ended December 31, 2018, or December 31, 2017.

Other intangible assets consist of the following:



	As of December 31, 2018
	Gross Carrying Amount		Accumulated Amortization			Net Amount		Weighted Average Remaining Amortization Period (in years)
Other intangible assets:
Customer lists / relationships	$	64,323	$	(37,088	)	$	27,235	9.6
Technology and other intangibles	44,460		(13,715		)	30,745		10.1
In process research and development	2,200		—			2,200		—
Other intangible assets, net	$	110,983	$	(50,803	)	$	60,180	9.8
Amortization expense for the year ended December 31, 2018			$	6,817

Amortization expense remaining for other intangible assets is as follows:



	Amortization expense
2019	$	6,754
2020	6,624
2021	6,467
2022	6,230
2023	4,225
Thereafter	29,880
Total future amortization expense	$	60,180



	As of December 31, 2017
	Gross Carrying Amount		Accumulated Amortization			Net Amount
Other intangible assets:
Customer lists / relationships	$	64,323	$	(33,685	)	$	30,638
Patents	10,319		(10,319		)	—
Technology and other intangibles	44,460		(10,355		)	34,105
In process research and development	2,200		—			2,200
Other intangible assets, net	$	121,302	$	(54,359	)	$	66,943
Amortization expense for the year ended December 31, 2017			$	6,603
Amortization expense for the year ended December 31, 2016			$	5,815

In 2018, a goodwill impairment test was performed by management with the assistance of a third-party valuation firm. As of December 31, 2018, it was concluded that the fair value of each of our reporting units exceeded their carrying values, and accordingly, no goodwill impairment was required.

Changes in the net carrying value amount of goodwill were as follows:



	Total
Goodwill as of December 31, 2016	$	61,744
Increase from acquisitions	9,313
Goodwill as of December 31, 2017	71,057
Increase from acquisition	—
Goodwill as of December 31, 2018	$	71,057