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Goodwill and Intangible Assets
 9 Months Ended
Sep. 26, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets
Goodwill by reportable segment was as follows (in thousands):
Probe CardsSystemsTotal
Goodwill, gross, as of December 29, 2018$172,482 $16,732 $189,214 
Addition - FRT GmbH Acquisition— 10,148 10,148 
Foreign currency translation— (166)(166)
Goodwill, gross, as of December 28, 2019172,482 26,714 199,196 
Addition - FRT GmbH Acquisition— 975 975 
Addition - Baldwin Park Acquisition19,519 — 19,519 
Foreign currency translation— 1,067 1,067 
Goodwill, gross, as of September 26, 2020$192,001 $28,756 $220,757 

No goodwill impairments have been recorded during the nine months ended September 26, 2020 and the twelve months ended December 28, 2019.

Intangible assets were as follows (in thousands):
September 26, 2020December 28, 2019
Intangible Assets GrossAccumulated AmortizationNetGrossAccumulated AmortizationNet
Developed technologies $156,659 $131,289 $25,370 $154,951 $116,138 $38,813 
Trade names7,870 7,231 639 7,816 6,976 840 
Customer relationships43,460 31,532 11,928 44,229 27,057 17,172 
Backlog1,744 1,744 — 1,676 891 785 
$209,733 $171,796 $37,937 $208,672 $151,062 $57,610 

Amortization expense was included in our Condensed Consolidated Statements of Income as follows (in thousands):
 Three Months EndedNine Months Ended
 September 26,
2020		September 28,
2019		September 26,
2020		September 28,
2019
Cost of revenues$4,985 $4,707 $15,661 $14,137 
Selling, general and administrative1,547 1,372 4,588 6,111 
$6,532 $6,079 $20,249 $20,248 

The estimated future amortization of intangible assets is as follows (in thousands):
Fiscal YearAmount
Remainder of 2020$6,105 
202114,945 
20225,708 
20233,954 
20242,200 
Thereafter5,025 
$37,937