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Pension and other post-retirement benefits - Benefit Obligations in Excess of Plan Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 727,981	$ 504,403
Fair value of plan assets	578,143	407,074
Projected benefit obligation	833,846	564,971
Fair value of plan assets	627,601	407,074
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	288,594	202,422
Fair value of plan assets	148,496	133,711
Projected benefit obligation	288,594	202,422
Fair value of plan assets	$ 148,496	$ 133,711

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Amount of plan asset for defined benefit pension plan with projected benefit obligation in excess of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920

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Amount of projected benefit obligation for defined benefit pension plan with projected benefit obligation in excess of plan assets.

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