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GOODWILL AND OTHER INTANGIBLES
 6 Months Ended
Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
GOODWILL AND OTHER INTANGIBLES GOODWILL AND OTHER INTANGIBLES
The following summarizes the change in goodwill during the six months ended June 30, 2021 (in thousands):
North AmericaInternationalTotal
Carrying amount, December 31, 2020$35,414 $52,862 $88,276 
Goodwill attributable to acquisitions (subject to change)3,900 — 3,900 
Foreign currency adjustments— (1,405)(1,405)
Carrying amount, June 30, 2021$39,314 $51,457 $90,771 

Other intangibles consisted of the following (in thousands):
June 30, 2021December 31, 2020
Gross Carrying AmountAccum. Amortiz.Net Carrying AmountGross Carrying AmountAccum. Amortiz.Net Carrying Amount
Intangible assets subject to amortization:
Customer relationships and other$46,196 $(8,878)$37,318 $46,989 $(6,436)$40,553 
Developed technology9,654 (2,278)7,376 8,669 (1,696)6,973 
Trade names230 (137)93 197 (105)92 
Intangible assets not subject to amortization:
Trade names8,111 — 8,111 8,374 — 8,374 
Total intangible assets$64,191 $(11,293)$52,898 $64,229 $(8,237)$55,992 

Amortization expense relating to other intangibles was as follows (in thousands):
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
Amortization expense$1,652 $1,624 $3,056 $2,053 

The remaining weighted-average amortization period for intangible assets is approximately 8.1 years.

Estimated amortization expense related to intangibles for each of the five years from 2021 (remaining) through 2025 and thereafter is as follows (in thousands):
Year Ending December 31,
2021 (remaining)$3,116 
20226,111 
20235,749 
20245,306 
20255,248 
Thereafter19,257 
Total amortization related to finite-lived intangible assets$44,787 
Indefinite-lived intangible assets8,111 
Net intangible assets$52,898 
No triggering events were identified in the second quarter of 2021 to require additional impairment testing.