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Goodwill and Other Intangible Assets (Tables)
3 Months Ended
Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in goodwill by segment
A summary of the changes in goodwill by segment for the three months ended March 31, 2019 is as follows: 
Consumer
Packaging
Display
and
Packaging
Paper and
Industrial
Converted
Products
Protective
Solutions
Total
Goodwill at December 31, 2018$617,332 $203,414 $256,947 $231,474 $1,309,167 
Foreign currency translation(690)— (929)108 (1,511)
Other(2,461)— 1,971 — (490)
Goodwill at March 31, 2019$614,181 $203,414 $257,989 $231,582 $1,307,166 
Summary of other intangible assets
A summary of other intangible assets as of March 31, 2019 and December 31, 2018 is as follows: 
March 31,
2019
December 31,
2018
Other Intangible Assets, gross:
Patents$22,496 $22,509 
Customer lists548,443 548,038 
Trade names31,010 31,174 
Proprietary technology28,333 28,748 
Land use rights286 282 
Other2,124 2,093 
Other Intangible Assets, gross$632,692 $632,844 
Accumulated Amortization:
Patents(10,021)(9,539)
Customer lists(256,696)(246,946)
Trade names(7,773)(7,413)
Proprietary technology(15,818)(15,400)
Land use rights(49)(48)
Other(1,491)(1,461)
Total Accumulated Amortization$(291,848)$(280,807)
Other Intangible Assets, net$340,844 $352,037