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Intangible Assets
 12 Months Ended
Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
The following table summarizes our goodwill by segment as of December 31, 2021 and 2020: 
(in thousands)20212020
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 2021 and 2020, indicated no impairment existed as of the test date.
The following table summarizes the components of our intangible assets at December 31, 2021 and 2020:
(in thousands)Gross
Amount		Accumulated
Amortization		Net Carrying
Amount
December 31, 2021
Customer Relationships$22,491 $13,469 $9,022 
Other26 4 22 
Total$22,517 $13,473 $9,044 
December 31, 2020
Customer Relationships$22,491 $12,370 $10,121 
Other26 3 23 
Total$22,517 $12,373 $10,144 
Amortization expense for these intangible assets for the years ended December 31, 2021, 2020 and 2019 totaled $1.1 million, $1.1 million, and $1.2 million.
Annual amortization expense for these intangible assets for the next five years is: 
(in thousands)20222023202420252026
Amortization Expense$1,100 $1,100 $1,100 $1,092 $1,090