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Customer Lists, Net
 9 Months Ended
Oct. 01, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Customer Lists, Net Distribution Agreements, Net
Distribution agreements, net, which are amortized on a straight-line basis and have an estimated useful life of 10 to 40 years, consisted of the following:

(in thousands)October 1, 2021December 31, 2020
Distribution agreements at cost
$952,547 $952,533 
Less: Accumulated amortization
117,144 98,780 
Distribution agreements, net
$835,403 $853,753 
Customer Lists, Net
Customer lists, net, which are amortized on a straight-line basis and have an estimated useful life of five to 12 years, consisted of the following:

(in thousands)October 1, 2021December 31, 2020
Customer lists at cost$25,288 $25,288 
Less: Accumulated amortization13,863 12,484 
Customer lists, net$11,425 $12,804