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Intangible Assets
 12 Months Ended
Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
The following table summarizes our goodwill by segment as of December 31, 2023 and 2022: 
(in thousands)20232022
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 2023 and 2022, indicated no impairment existed as of the test date.
The following table summarizes the components of our intangible assets at December 31, 2023 and 2022:
(in thousands)Gross
Amount		Accumulated
Amortization		Net Carrying
Amount
December 31, 2023
Customer Relationships$22,491 $15,667 $6,824 
Other26 7 19 
Total22,517 15,674 6,843 
December 31, 2022
Customer Relationships22,491 14,568 7,923 
Other26 6 20 
Total$22,517 $14,574 $7,943 
Amortization expense for these intangible assets for each of the years ended December 31, 2023, 2022 and 2021 totaled $1.1 million.
Annual amortization expense for these intangible assets for the next five years is: 
(in thousands)20242025202620272028
Amortization Expense$1,100 $1,100 $1,092 $1,090 $554