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Shareholders' equity (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Schedule of Weighted Average Number of Shares | The following table provides a reconciliation of basic to diluted weighted average shares outstanding:
| 2020 |  | 2019 |  | 2018
Basic | 46,488 |  |  | 46,200 |  |  | 45,689 |
Dilutive effect of share based awards | 799 |  |  | 890 |  |  | 970 |
Dilutive effect of convertible notes and warrants | — |  |  | — |  |  | 142 |
Diluted | 47,287 |  |  | 47,090 |  |  | 46,801 |
Schedule of Accumulated Other Comprehensive Income (Loss) | The following tables provides information relating to the changes in accumulated other comprehensive income (loss), net of tax, for the years ended December 31, 2020 and 2019:
| Cash Flow Hedges |  | Pension and Other Postretirement Benefit Plans |  | Foreign Currency Translation Adjustment |  | Accumulated Other Comprehensive Income (Loss)
Balance at December 31, 2018 | $ | 807 |  |  | $ | (131,380) |  |  | $ | (210,512) |  |  | $ | (341,085) |
Other comprehensive income (loss) before reclassifications | 1,062 |  |  | (12,811) |  |  | 4,195 |  |  | (7,554) |
Amounts reclassified from accumulated other comprehensive (loss) income | (1,134) |  |  | 5,381 |  |  | — |  |  | 4,247 |
Net current-year other comprehensive (loss) income | (72) |  |  | (7,430) |  |  | 4,195 |  |  | (3,307) |
Balance at December 31, 2019 | 735 |  |  | (138,810) |  |  | (206,317) |  |  | (344,392) |
Other comprehensive (loss) income before reclassifications | (3,331) |  |  | (17,032) |  |  | 59,758 |  |  | 39,395 |
Amounts reclassified from accumulated other comprehensive income | 2,114 |  |  | 5,585 |  |  | — |  |  | 7,699 |
Net current-year other comprehensive (loss) income | (1,217) |  |  | (11,447) |  |  | 59,758 |  |  | 47,094 |
Balance at December 31, 2020 | $ | (482) |  |  | $ | (150,257) |  |  | $ | (146,559) |  |  | $ | (297,298) |
Reclassification out of Accumulated Other Comprehensive Income | The following table provides information relating to the losses (gains) recognized in the statements of income including the reclassifications of losses (gains) in accumulated other comprehensive (loss) income into expense/(income), net of tax, for the years ended December 31, 2020, 2019 and 2018:
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
Losses (gains) on designated foreign exchange forward contracts:
Cost of goods sold | $ | 2,354 |  |  | $ | (1,284) |  |  | $ | (2,270) |
Total before tax | 2,354 |  |  | (1,284) |  |  | (2,270) |
Taxes (benefit) expense | (240) |  |  | 150 |  |  | 163 |
Net of tax | $ | 2,114 |  |  | $ | (1,134) |  |  | $ | (2,107) |
Amortization of pension and other postretirement benefits items:
Actuarial losses (1) | $ | 7,253 |  |  | $ | 6,930 |  |  | $ | 7,305 |
Prior-service credits (1) | 33 |  |  | 82 |  |  | 251 |
Total before tax | 7,286 |  |  | 7,012 |  |  | 7,556 |
Tax benefit | (1,701) |  |  | (1,631) |  |  | (1,733) |
Net of tax | $ | 5,585 |  |  | $ | 5,381 |  |  | $ | 5,823 |
Impact on income from continuing operations, net of tax | $ | 7,699 |  |  | $ | 4,247 |  |  | $ | 3,716 |
(1)These accumulated other comprehensive (loss) income components are included in the computation of net benefit cost of pension and other postretirement benefit plans (see Note 16 for additional information).

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