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GOODWILL AND INTANGIBLE ASSETS (Tables)
 9 Months Ended
Sep. 26, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of components of amortized intangible assets
The components of amortized intangible assets at September 26, 2020 and December 28, 2019 were as follows:
September 26, 2020
Gross
Carrying
Amount		Accumulated
Amortization		Weighted
Average
Life
Customer Relationships
$232,511 $148,198 13 years
Patents & Proprietary Technology
25,240 7,699 14 years
Other
7,492 6,553 4 years
$265,243 $162,450 

December 28, 2019
Gross
Carrying
Amount		Accumulated
Amortization		Weighted
Average
Life
Customer Relationships
$237,626 $149,720 13 years
Patents & Proprietary Technology
24,068 6,358 14 years
Other
8,054 7,035 5 years
$269,748 $163,113 
Schedule of amortization expense for intangible assets
Amortization expense for intangible assets for the thirteen and thirty-nine weeks ended September 26, 2020 and September 28, 2019, respectively was as follows:
Thirteen weeks endedThirty-nine weeks ended
2020201920202019
$4,518 $4,484 $13,621 $13,506 
Schedule of future estimated amortization expense
Estimated annual amortization expense related to finite-lived intangible assets is as follows:
Estimated
Amortization
Expense
2020$17,687 
202115,005 
202213,027 
202311,086 
20249,446 
Schedule of non-amortized intangible assets The carrying value of trade names at September 26, 2020 and December 28, 2019 are as follows:
September 26,
2020		December 28,
2019		Year Acquired
Newmark$11,111 $11,111 2004
Webforge7,489 9,143 2010
Convert Italia S.p.A8,721 8,378 2018
Valmont SM8,317 7,966 2014
Ingal EPS/Ingal Civil Products7,261 7,454 2010
Walpar3,500 3,500 2018
Shakespeare4,000 4,000 2014
Other14,489 17,555 
$64,888 $69,107 
Schedule of carrying amount of goodwill
The carrying amount of goodwill by segment as of September 26, 2020 and December 28, 2019 was as follows:
Engineered
Support
Structures
Segment		Utility
Support
Structures
Segment		Coatings
Segment		Irrigation
Segment		Total
Gross Balance December 28, 2019$228,634 $130,594 $93,747 $25,136 $478,111 
   Accumulated impairment losses(18,670)(14,355)(16,222)— (49,247)
Balance at December 28, 2019209,964 116,239 77,525 25,136 428,864 
   Acquisitions— 1,100 — 5,038 6,138 
Asset impairment(12,575)— — — (12,575)
Foreign currency translation(1,605)1,629 (409)(95)(480)
Balance at September 26, 2020$195,784 $118,968 $77,116 $30,079 $421,947