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Goodwill and other intangible assets
6 Months Ended
Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
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,
2021202020212020
(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 LifeGross ValueAccumulated
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 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&DIndefinite400 — 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.