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Income taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Income Tax Disclosure [Abstract] |  |
Property, plant and equipment | $ (97,806) | $ (91,752)
Intangibles | (96,057) | (110,796)
Leases | (75,587) | (79,531)
Gross deferred tax liabilities | (269,450) | (282,079)
Retiree health benefits | 2,935 | 4,065
Foreign loss carryforwards | 76,462 | 81,143
U.S. Federal loss and credit carryforwards | 34,700 | 78,100
Capital loss carryforwards | 4,050 | 3,121
Employee benefits | 46,503 | 47,134
Leases | 78,518 | 84,076
Accrued liabilities and other assets | 75,611 | 69,341
Gross deferred tax assets | 318,779 | 366,980
Valuation allowance on deferred tax assets | (93,992) | (128,435)
Total deferred taxes, net | $ (44,663) | $ (43,534)

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