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Shareholders' equity - Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Pension payment timing related charges	$ 686	$ 7,498	$ 0
Income before income taxes	375,657	508,707	310,716
Income tax effect	(89,422)	(107,367)	137,246
Total reclassifications, net of tax	4,834	9,439	37,212
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications, net of tax	4,834	9,439	5,445
Retirement Plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications, net of tax	4,834	9,439	5,445
Retirement Plans | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of prior service cost	(481)	(403)	63
Amortization of actuarial loss	6,246	5,544	8,774
Pension payment timing related charges	686	7,498	0
Income before income taxes	6,451	12,639	8,837
Income tax effect	$ (1,617)	$ (3,200)	$ (3,392)

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