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Other long-term liabilities - Changes in Environmental Remediation Obligation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Accrual for Environmental Loss Contingencies [Roll Forward]
Opening balance	$ 69,383	$ 58,061
Remediation activities	(9,865)	(5,130)
Accretion	1,025	436
Changes in cash flow estimates	2,265	3,828
Revision in assumptions	(7,584)	3,402
Obligation assumed from business acquisition	0	8,786
Closing balance	$ 55,224	$ 69,383

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- Definition

Accrual for Environmental Loss Contingencies, Accretion

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- Definition

Accrual for Environmental Loss Contingencies, Increase (Decrease) for Revision in Assumptions

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- Definition

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Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Environmental Remediation Obligation

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- Definition

Total costs accrued as of the balance sheet date for environmental loss contingencies.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

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-Name Accounting Standards Codification
-Topic 410
-SubTopic 30
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-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859

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- Definition

Amount of expense (reversal of expense) which increases (decreases) the accrual for environmental loss contingencies from revisions in estimates to existing obligations. Excludes changes related to business acquisitions, divestitures, or currency movement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 450
-SubTopic 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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