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PURCHASED INTANGIBLE ASSETS
 3 Months Ended
Mar. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
PURCHASED INTANGIBLE ASSETS PURCHASED INTANGIBLE ASSETS
 
Our purchased intangible assets consisted of the following as of March 31, 2022:
GrossAccumulated
Amortization		Net
Core technology$15,228 $(13,989)$1,239 
Customer relationships246,034 (38,588)207,446 
Customer backlog21,500 (9,214)12,286 
Trademarks / Trade names23,981 (2,384)21,597 
Total intangible assets$306,743 $(64,175)$242,568 
 
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 March 31, 2022 from December 31, 2021 primarily was 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.