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Restructuring and asset impairment - Restructuring Accrual Activity for Given Years (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restructuring Reserve [Roll Forward]
Liability, beginning balance	$ 16,466	$ 11,357
Charges	9,176	67,729	$ 44,819
Cash (payments)/receipts	(8,833)	(34,796)
Asset write downs/disposals	(3,713)	(28,214)
Foreign currency translation	(306)	390
Liability, ending balance	12,790	16,466	11,357
Severance and Termination Benefits
Restructuring Reserve [Roll Forward]
Liability, beginning balance	15,955	10,765
Charges	13,097	36,997	24,864
Cash (payments)/receipts	(17,828)	(32,189)
Asset write downs/disposals	0	0
Foreign currency translation	(307)	382
Liability, ending balance	10,917	15,955	10,765
Asset Impairment/Disposal of Assets
Restructuring Reserve [Roll Forward]
Liability, beginning balance	0	0
Charges	(9,116)	22,394	9,674
Cash (payments)/receipts	15,308	6,963
Asset write downs/disposals	(6,192)	(29,357)
Foreign currency translation	0	0
Liability, ending balance	0	0	0
Other Costs
Restructuring Reserve [Roll Forward]
Liability, beginning balance	511	592
Charges	5,195	8,338
Cash (payments)/receipts	(6,313)	(9,570)
Asset write downs/disposals	2,479	1,143
Foreign currency translation	1	8
Liability, ending balance	$ 1,873	$ 511	$ 592

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Restructuring reserve asset write offs.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 45
-Paragraph 3
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Carrying amount as of the balance sheet date of known and estimated obligations associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid in the next twelve months or in the normal operating cycle if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(20))
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of foreign currency translation gain (loss) which decreases (increases) the restructuring reserve.

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-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
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