Goodwill and other intangible assets |
Goodwill and other intangible assets The change in the carrying amount of goodwill is as follows: | | | | | | | | | | | | | | | | | | | | | | | | | Three Months Ended June 30, | | Six Months Ended June 30, | | 2021 | | 2020 | | 2021 | | 2020 | | (in thousands) | Goodwill, beginning of period | $ | 541,850 | | | $ | 539,818 | | | $ | 541,480 | | | $ | 539,818 | | Goodwill acquired | — | | | — | | | 370 | | | — | | Goodwill, end of period | $ | 541,850 | | | $ | 539,818 | | | $ | 541,850 | | | $ | 539,818 | |
The gross carrying amount and accumulated amortization of intangible assets other than goodwill are as follows: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Useful Life | | Gross Value | | Accumulated Amortization | | Net Carrying Value | | Weighted‑ Average Remaining Useful Life | | (in thousands) | Trademarks | 8 years | | $ | 34,320 | | | $ | 13,454 | | | $ | 20,866 | | | 4.8 years | Customer relationships | 2 ‑ 12 years | | 214,428 | | | 55,810 | | | 158,618 | | | 8.7 years | Developed technology | 5 years | | 54,563 | | | 31,173 | | | 23,390 | | | 2.3 years | Non‑competes | 2 years | | 90 | | | 86 | | | 4 | | | 0.1 years | Balance, December 31, 2020 | | | $ | 303,401 | | | $ | 100,523 | | | $ | 202,878 | | | | | | | | | | | | | | Trademarks | 8 years | | $ | 34,300 | | | $ | 15,578 | | | $ | 18,722 | | | 4.3 years | Customer relationships | 2 ‑ 12 years | | 214,408 | | | 64,893 | | | 149,515 | | | 8.2 years | Developed technology | 5 years | | 57,193 | | | 36,809 | | | 20,384 | | | 2.2 years | Non‑competes | 2 years | | 90 | | | 90 | | | — | | | — | IPR&D | Indefinite | | 400 | | | — | | | 400 | | | | Balance, June 30, 2021 | | | $ | 306,391 | | | $ | 117,370 | | | $ | 189,021 | | | |
Amortization expense was $8.5 million and $8.3 million for the three months ended June 30, 2021 and 2020, respectively. Amortization expense was $16.9 million and $16.7 million for the six months ended June 30, 2021 and 2020, respectively. There were no impairments to goodwill or intangible assets recorded for the three and six months ended June 30, 2021 and 2020.
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