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Employee benefits - Breakdown of pension and OPEB plans assets and liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Pension Plans
Defined Benefit Plan Disclosure
Current liabilities	$ 227	$ 225
Non-current liabilities	52,389	68,510
OPEB Plan
Defined Benefit Plan Disclosure
Current liabilities	6,456	8,007
Non-current liabilities	$ 162,225	$ 145,408

X

- Definition

Amount of liability, recognized in statement of financial position, for defined benefit pension plan, classified as current. Excludes other postretirement benefit plan.

+ References

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- Definition

Amount of liability, recognized in statement of financial position, for defined benefit pension plan, classified as noncurrent. Excludes other postretirement benefit plan.

+ References

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-Publisher FASB
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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