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Other long-term liabilities - Changes in Environmental Remediation Obligation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Accrual for Environmental Loss Contingencies [Roll Forward]
Opening balance	$ 58,061	$ 55,621
Remediation activities	(5,130)	(1,678)
Accretion	436	1,065
Changes in cash flow estimates	3,828	981
Revision in assumptions	3,402	2,072
Obligation assumed from business acquisition	8,786	0
Closing balance	$ 69,383	$ 58,061

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- Definition

Accrual for Environmental Loss Contingencies, Accretion

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

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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
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-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

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-Topic 410
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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
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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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