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Intangible Assets
 9 Months Ended
Sep. 29, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
The following table summarizes acquired intangible assets as follows: 
September 29, 2018December 31, 2017
(In thousands)
Weighted
Average Life
Gross Carrying
Amount
Accumulated
Amortization
Gross Carrying
Amount
Accumulated
Amortization
Patents
11 years$2,146 $1,694 $2,146 $1,629 
Non-compete Agreement
4 years10,900 3,932 10,900 1,687 
Trade Names
10 years11,465 4,915 11,492 4,114 
Completed and Unpatented Technology
10 years38,069 14,951 38,114 11,931 
Backlog
2 years14,424 14,424 14,424 12,184 
Customer Relationships
15 years137,984 36,725 137,967 30,005 
Total Intangible Assets
12 years$214,988 $76,641 $215,043 $61,550 
All acquired intangible assets other than goodwill and one trade name are being amortized. Amortization expense for acquired intangibles is summarized as follows: 
Nine Months Ended Three Months Ended 
(In thousands)
September 29, 2018September 30, 2017September 29, 2018September 30, 2017
Amortization Expense
$15,144 $8,269 $4,276 $2,929 
Amortization expense for acquired intangible assets expected for 2018 and for each of the next five years is summarized as follows:
(In thousands)
2018 $19,403 
2019 16,707 
2020 15,981 
2021 14,072 
2022 13,637 
2023 12,470