Other comprehensive income (loss) - Disclosure of accumulated other comprehensive income (loss) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Foreign Currency Translation
Beginning Balance	$ (52,378)	$ (46,397)	$ (49,936)	$ (43,034)
Other comprehensive income (loss) before reclassifications	155	(605)	(2,287)	(3,968)
Net change	155	(605)	(2,287)	(3,968)
Ending Balance	(52,223)	(47,002)	(52,223)	(47,002)
Adjustment of pension and postretirement benefit plans
Beginning Balance	(196,491)	(199,895)	(203,836)	(205,408)
Amounts reclassified from accumulated other comprehensive income (loss) for amortization of net losses	3,673	3,285	11,018	9,856
Amounts reclassified from accumulated other comprehensive income (loss) for amortization of prior service credit	0	529	0	1,587
Net change	3,673	2,756	11,018	8,269
Ending Balance	(192,818)	(197,139)	(192,818)	(197,139)
Unrealized net holding gains (losses) on debt securities
Beginning Balance	58,044	(250,422)	(173,811)	(102,775)
Other comprehensive (loss) income before reclassifications	50,970	(39,845)	282,825	(187,492)
Amounts reclassified from accumulated other comprehensive (loss) income for gains on securities	(16)	0	(16)	0
Net change	50,986	(39,845)	282,841	(187,492)
Ending Balance	109,030	(290,267)	109,030	(290,267)
Unrealized holding gains on equity securities
Beginning Balance	0	0	0	605
Reclassification to retained earnings due to cumulative effect of accounting change	0	0	0	(605)
Net change	0	0	0	(605)
Ending Balance	0	0	0	0
Unrealized net (losses) gain on cash flow hedges
Beginning Balance	(388)	(78)	(391)	(40)
Reclassification to retained earnings due to cumulative effect of accounting change	0	0	(50)	0
Other comprehensive income (loss) before reclassification	(3,201)	208	(4,349)	790
Amounts reclassified from other accumulated other comprehensive income (loss)	720	89	1,921	(531)
Net change	(2,481)	297	(2,478)	259
Ending Balance	(2,869)	219	(2,869)	219
Accumulated other comprehensive (loss) income	$ (138,880)	$ (534,189)	$ (138,880)	$ (534,189)	$ (427,974)

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- Definition

Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

+ References

+ Details

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- References

No definition available.

+ Details

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