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Shareholders' equity - Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
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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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