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Other comprehensive income (loss) - Disclosure of accumulated other comprehensive income (loss) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Foreign Currency Translation      
Beginning Balance $ (49,936,000) $ (43,034,000) $ (39,956,000)
Other comprehensive income (loss) before reclassifications (6,847,000) (6,902,000) (3,078,000)
Reclassification adjustment for (gains) losses included in net income (loss) 6,847,000 6,902,000 3,078,000
Net change (6,847,000) (6,902,000) (3,078,000)
Ending Balance (56,783,000) (49,936,000) (43,034,000)
Adjustment of pension and postretirement benefit plans      
Beginning Balance (203,836,000) 205,408,000 (211,610,000)
Other comprehensive income (loss) before reclassification (13,671,000) (9,453,000) (5,164,000)
Amounts reclassified from accumulated other comprehensive income (loss) for amortization of net losses 14,691,000 13,141,000 13,684,000
Amounts reclassified from accumulated other comprehensive income (loss) for amortization of prior service credit 0 (2,116,000) (2,318,000)
Net change 1,020,000 1,572,000 6,202,000
Ending Balance (202,816,000) (203,836,000) 205,408,000
Unrealized net holding gains (losses) on debt securities      
Beginning Balance (173,811,000) (102,775,000) (69,003,000)
Other comprehensive (loss) income before reclassifications 265,950,000 (71,036,000) (40,446,000)
Other-than-temporary impairment amounts reclassified from accumulated other comprehensive (loss) income 0 0 6,740,000
Amounts reclassified from accumulated other comprehensive (loss) income for gains on securities 16,000 0 (66,000)
Net change 265,966,000 (71,036,000) (33,772,000)
Ending Balance 92,155,000 (173,811,000) (102,775,000)
Unrealized holding gains on equity securities      
Beginning Balance 0 605,000 685,000
Reclassification to retained earnings due to cumulative effect of accounting change 0 (605,000) 0
Other comprehensive income before reclassifications 0 0 121,000
Amounts reclassified from accumulated other comprehensive (loss) income for gains on securities 0 0 (201,000)
Net change 0 (605,000) (80,000)
Ending Balance 0 0 605,000
Unrealized net (losses) gain on cash flow hedges      
Beginning Balance (391,000) (40,000) (402,000)
Reclassification to retained earnings due to cumulative effect of accounting change (50,000) 0 0
Other comprehensive income (loss) before reclassification (4,439,000) 326,000 (790,000)
Amounts reclassified from other accumulated other comprehensive income (loss) 2,386,000 (677,000) 1,152,000
Net change (2,103,000) (351,000) 362,000
Ending Balance (2,494,000) (391,000) (40,000)
Accumulated other comprehensive (loss) income $ (169,938,000) $ (427,974,000) $ (350,652,000)