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Other long-term liabilities - Changes in Environmental Remediation Obligation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Accrual for Environmental Loss Contingencies [Roll Forward]
Opening balance	$ 55,621	$ 54,322
Remediation activities	(1,678)	(2,163)
Accretion	1,065	1,479
Changes in cash flow estimates	981	4,051
Revision in assumptions	2,072	(2,068)
Closing balance	$ 58,061	$ 55,621

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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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- Definition

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

+ References

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-Topic 450
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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

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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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