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Goodwill and other intangible assets - Summary of Other Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Other Intangible Assets, Gross: |  |
Other Intangible Assets, Gross | $ 679,206 | $ 709,487
Accumulated Amortization | (401,063) | (387,553)
Other Intangible Assets, Net | 278,143 | 321,934
Patents |  |
Other Intangible Assets, Gross: |  |
Other Intangible Assets, Gross | 29,315 | 29,325
Accumulated Amortization | (16,275) | (14,511)
Customer lists |  |
Other Intangible Assets, Gross: |  |
Other Intangible Assets, Gross | 592,195 | 622,430
Accumulated Amortization | (347,274) | (339,159)
Trade names |  |
Other Intangible Assets, Gross: |  |
Other Intangible Assets, Gross | 32,043 | 32,088
Accumulated Amortization | (14,106) | (12,156)
Proprietary technology |  |
Other Intangible Assets, Gross: |  |
Other Intangible Assets, Gross | 22,846 | 22,813
Accumulated Amortization | (21,394) | (19,833)
Other |  |
Other Intangible Assets, Gross: |  |
Other Intangible Assets, Gross | 2,807 | 2,831
Accumulated Amortization | $ (2,014) | $ (1,894)

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 + Details
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