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Intangible Assets
 12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
The following tables summarizes our goodwill by segment as of December 31, 2020 and 2019: 
(in thousands)20202019
Manufacturing$18,270 $18,270 
Plastics19,302 19,302 
Total Goodwill$37,572 $37,572 
Our annual goodwill impairment testing, performed in the fourth quarters of 2020 and 2019, indicated no impairment existed as of the test date.
The following table summarizes the components of our intangible assets at December 31, 2020 and 2019:
(in thousands)Gross
Amount		Accumulated
Amortization		Net Carrying
Amount
December 31, 2020
Customer Relationships$22,491 $12,370 $10,121 
Other26 3 23 
Total$22,517 $12,373 $10,144 
December 31, 2019
Customer Relationships$22,491 $11,259 $11,232 
Other179 121 58 
Total$22,670 $11,380 $11,290 
Amortization expense for these intangible assets was as follows for the years ended December 31, 2020, 2019 and 2018: 
(in thousands)202020192018
Amortization Expense$1,146 $1,186 $1,315 
Estimated annual amortization expense for these intangible assets for the next five years is: 
(in thousands)20212022202320242025
Estimated Amortization Expense$1,100 $1,100 $1,100 $1,100 $1,092