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PURCHASED INTANGIBLE ASSETS
 6 Months Ended
Jun. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
PURCHASED INTANGIBLE ASSETS PURCHASED INTANGIBLE ASSETS
 
Our purchased intangible assets consisted of the following as of June 30, 2022:
GrossAccumulated
Amortization		Net
Core technology$14,059 $(13,438)$621 
Customer relationships244,692 (40,255)204,437 
Customer backlog21,500 (18,429)3,071 
Trademarks / Trade names23,874 (2,638)21,236 
Total intangible assets$304,125 $(74,760)$229,365 
 
Our purchased intangible assets consisted of the following as of December 31, 2021:
GrossAccumulated
Amortization		Net
Core technology$15,647 $(14,209)$1,438 
Customer relationships246,718 (36,047)210,671 
Customer backlog21,500 — 21,500 
Trademarks / Trade names24,037 (2,070)21,967 
Total intangible assets$307,902 $(52,326)$255,576 
 
The change in the gross value of our purchased intangible assets at June 30, 2022 from December 31, 2021 was primarily due to foreign currency translation and an adjustment due to recognition of tax benefit of tax amortization previously applied to certain goodwill related to the DynaEnergetics and NobelClad reporting units. After the goodwill associated with each reporting unit was impaired at December 31, 2015 and September 30, 2017, respectively, the tax amortization reduces other intangible assets related to the historical acquisition.