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Employee benefit plans - Company's Projected Benefit Payments (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Retirement Plans  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 27,551
2022 27,615
2023 27,786
2024 28,103
2025 29,065
2026-2030 152,203
Retiree Health and Life Insurance Plans  
Defined Benefit Plan Disclosure [Line Items]  
2021 1,229
2022 1,222
2023 1,194
2024 1,147
2025 1,110
2026-2030 $ 5,229