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Goodwill and Intangible Assets
 6 Months Ended
Jun. 27, 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  
Foreign currency translation—  122  122  
Goodwill, gross, as of June 27, 2020$172,482  $27,811  $200,293  

No goodwill impairments have been recorded during the six months ended June 27, 2020 and the twelve months ended December 28, 2019.
Intangible assets were as follows (in thousands):
June 27, 2020December 28, 2019
Intangible Assets GrossAccumulated AmortizationNetGrossAccumulated AmortizationNet
Developed technologies $155,766  $125,918  $29,848  $154,951  $116,138  $38,813  
Trade names7,817  7,125  692  7,816  6,976  840  
Customer relationships43,217  29,972  13,245  44,229  27,057  17,172  
Backlog1,682  1,682  —  1,676  891  785  
$208,482  $164,697  $43,785  $208,672  $151,062  $57,610  

Amortization expense was included in our Condensed Consolidated Statements of Income as follows (in thousands):
 Three Months EndedSix Months Ended
 June 27,
2020		June 29,
2019		June 27,
2020		June 29,
2019
Cost of revenues$4,926  $4,711  $10,676  $9,430  
Selling, general and administrative1,528  2,368  3,041  4,739  
$6,454  $7,079  $13,717  $14,169  

The estimated future amortization of intangible assets is as follows (in thousands):
Fiscal YearAmount
Remainder of 2020$12,551  
202114,796  
20225,605  
20233,864  
20242,122  
Thereafter4,847  
$43,785