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Goodwill and other intangible assets (Tables)
12 Months Ended
Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in goodwill anges in the carrying amount of goodwill by segment for the year ended December 31, 2021, are as follows:
Consumer
Packaging
Industrial Paper
Packaging
All Other
Total
Balance as of January 1, 2021$581,244 $369,315 $438,696 $1,389,255 
Acquisitions
— 6,014 — 6,014 
    Divestitures(1,058)— (53,039)(54,097)
    Measurement period adjustments1,512 — — 1,512 
    Foreign currency translation(9,282)(7,549)(1,352)(18,183)
Balance as of December 31, 2021$572,416 $367,780 $384,305 $1,324,501 
Summary of other intangible assets Details at December 31 are as follows:
20212020
Other Intangible Assets, Gross:
Patents$29,315 $29,325 
Customer lists592,195 622,430 
Trade names32,043 32,088 
Proprietary technology22,846 22,813 
Other2,807 2,831 
Other Intangible Assets, Gross$679,206 $709,487 
Accumulated Amortization:
Patents$(16,275)$(14,511)
Customer lists(347,274)(339,159)
Trade names(14,106)(12,156)
Proprietary technology(21,394)(19,833)
Other(2,014)(1,894)
Accumulated Amortization$(401,063)$(387,553)
Other Intangible Assets, Net$278,143 $321,934