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Goodwill and other intangible assets

6 Months Ended

Jun. 30, 2020

Goodwill and other intangible assets

Note 5. Goodwill and other intangible assets

The change in the carrying amount of goodwill is as follows:


	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2020		2019		2020		2019

	(in thousands)
Goodwill, beginning of period	$	539,818	$	529,145	$	539,818	$	501,145
Goodwill acquired		—		—		—		28,000
Goodwill, end of period	$	539,818	$	529,145	$	539,818	$	529,145

The gross carrying amount and accumulated amortization of intangible assets other than goodwill are as follows:


								Weighted‑
								Average
				Accumulated		Net Carrying		Remaining
	Useful Life	Gross Value		Amortization		Value		Useful Life

		(in thousands)
Trademarks	1‑8 years		34,320		9,167		25,153	5.8 years
Customer relationships	2‑12 years		214,320		37,564		176,756	9.7 years
Developed technology	5 years		53,560		20,419		33,141	3.2 years
Non‑competes	2 years		90		41		49	1.1 years
Balance, December 31, 2019		$	302,290	$	67,191	$	235,099
Trademarks	8 years		34,320		11,310		23,010	5.3 years
Customer relationships	2‑12 years		214,320		46,711		167,609	9.2 years
Developed technology	5 years		53,560		25,775		27,785	2.7 years
Non‑competes	2 years		90		64		26	0.6 years
Balance, June 30, 2020		$	302,290	$	83,860	$	218,430

Amortization expense was $8.3 million and $8.1 million for the three months ended June 30, 2020 and 2019, respectively. Amortization expense was $16.7 million and $16.2 million for the six months ended June 30, 2020 and 2019, respectively.

There were no impairments to goodwill or intangible assets recorded for the three and six months ended June 30, 2020 and 2019.