Other Intangible Assets

3 Months Ended

Mar. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Other Intangible Assets

Note 7 Other Intangible Assets

Other intangible assets (in thousands):

		March 31, 2019						December 31, 2018
		Gross Amount		Accumulated Amortization		Net		Gross Amount		Accumulated Amortization		Net
Amortizing intangible assets:
	Customer relationships	$	41,507	$	31,117	$	10,390	$	30,993	$	30,993	$	—
	Developed technology	30,164		24,571		5,593		24,446		24,446		—
	Patents, trademarks and tradenames	10,506		3,801		6,705		3,765		3,765		—
	Service contracts	5,474		5,470		4		5,538		5,512		26
	Total	$	87,651	$	64,959	$	22,692	$	64,742	$	64,716	$	26

Amortization expense related to other intangible assets during the quarters ended March 31, 2019, and March 31, 2018, was $1.0 million and $0.1 million, respectively.

Estimated future amortization of other intangible assets (in thousands):

	Future Amortization
2019 (Excluding the three months ended March 31, 2019)	$	3,392
2020	4,518
2021	4,518
2022	2,634
2023	1,138
Thereafter	6,492
	$	22,692

See Note 5Acquisitions for details on our acquisitions. No impairments of other intangible assets were recognized in either of the three months ended March 31, 2019 or 2018.