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Goodwill and other intangible assets (Tables)
 12 Months Ended
Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in goodwill Changes in the carrying amount of goodwill by segment for the year ended December 31, 2022, are as follows:
Consumer
Packaging
Industrial Paper
Packaging
All Other
Total
Balance as of January 1, 2022$572,416 $367,780 $384,305 $1,324,501 
Acquisitions
366,098 34,473 — 400,571 
    Measurement period adjustments(28,987)— — (28,987)
    Foreign currency translation(10,902)(7,427)(2,445)(20,774)
Balance as of December 31, 2022$898,625 $394,826 $381,860 $1,675,311 
Summary of other intangible assets Details at December 31 are as follows:
20222021
Other Intangible Assets, Gross:
Patents$29,303 $29,315 
Customer lists1,092,232 592,195 
Trade names34,220 32,043 
Proprietary technology57,720 22,846 
Other6,721 2,807 
Other Intangible Assets, Gross$1,220,196 $679,206 
Accumulated Amortization:
Patents$(17,889)$(16,275)
Customer lists(417,034)(347,274)
Trade names(15,892)(14,106)
Proprietary technology(25,113)(21,394)
Other(2,670)(2,014)
Accumulated Amortization$(478,598)$(401,063)
Other Intangible Assets, Net$741,598 $278,143