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Goodwill and Other Intangible Assets (Tables)
 6 Months Ended
Jul. 04, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in goodwill by segment A summary of the changes in goodwill by segment for the six months ended July 4, 2021 is as follows: 
Consumer
Packaging		Industrial Paper PackagingAll OtherTotal
Goodwill at December 31, 2020
$592,310 $317,958 $478,987 $1,389,255 
2021 Acquisitions— 917 — 917 
Dispositions— — (53,039)(53,039)
Foreign currency translation(2,065)(2,958)(222)(5,245)
Measurement period adjustments1,512 — — 1,512 
Goodwill at July 4, 2021$591,757 $315,917 $425,726 $1,333,400 
Summary of other intangible assets A summary of other intangible assets as of July 4, 2021 and December 31, 2020 is as follows:    
July 4,
2021		December 31,
2020
Other Intangible Assets, gross:
Patents$29,320 $29,325 
Customer lists588,410 622,430 
Trade names32,118 32,088 
Proprietary technology22,868 22,813 
Other2,818 2,831 
Total Other Intangible Assets, gross$675,534 $709,487 
Accumulated Amortization:
Patents$(15,401)$(14,511)
Customer lists(329,056)(339,159)
Trade names(13,221)(12,156)
Proprietary technology(20,704)(19,833)
Other(1,959)(1,894)
Total Accumulated Amortization$(380,341)$(387,553)
Other Intangible Assets, net$295,193 $321,934