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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)

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