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Shareholders' equity (Tables) | 6 Months Ended
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Jun. 28, 2020
Equity [Abstract] |
Reconciliation of Basic to Diluted Weighted Average Common Shares Outstanding | The following table provides a reconciliation of basic to diluted weighted average number of common shares outstanding:
| Three Months Ended |  |  |  | Six Months Ended |  |
| June 28, 2020 |  | June 30, 2019 |  | June 28, 2020 |  | June 30, 2019
| (Shares in thousands) |  |  |  |  |  |
Basic | 46,442 |  |  | 46,172 |  |  | 46,412 |  |  | 46,111 |
Dilutive effect of share-based awards | 800 |  |  | 864 |  |  | 825 |  |  | 878 |
Diluted | 47,242 |  |  | 47,036 |  |  | 47,237 |  |  | 46,989 |
Change in Accumulated Other Comprehensive Income (Loss) | The following tables provide information relating to the changes in accumulated other comprehensive loss, net of tax, for the six months ended June 28, 2020 and June 30, 2019:
| Cash Flow Hedges |  | Pension and Other Postretirement Benefit Plans |  | Foreign Currency Translation Adjustment |  | Accumulated Other Comprehensive (Loss) Income
| (Dollars in thousands) |  |  |  |  |  |
Balance as of December 31, 2019 | $ | 735 |  |  | $ | (138,810) |  |  | $ | (206,317) |  |  | $ | (344,392) |
Other comprehensive (loss) income before reclassifications | (4,189) |  |  | 183 |  |  | (545) |  |  | (4,551) |
Amounts reclassified from accumulated other comprehensive income | (723) |  |  | 2,851 |  |  | — |  |  | 2,128 |
Net current-period other comprehensive (loss) income | (4,912) |  |  | 3,034 |  |  | (545) |  |  | (2,423) |
Balance as of June 28, 2020 | $ | (4,177) |  |  | $ | (135,776) |  |  | $ | (206,862) |  |  | $ | (346,815) |
| Cash Flow Hedges |  | Pension and Other Postretirement Benefit Plans |  | Foreign Currency Translation Adjustment |  | Accumulated Other Comprehensive (Loss) Income
| (Dollars in thousands) |  |  |  |  |  |
Balance as of December 31, 2018 | $ | 807 |  |  | $ | (131,380) |  |  | $ | (210,512) |  |  | $ | (341,085) |
Other comprehensive income (loss) before reclassifications | 429 |  |  | (13) |  |  | 12,332 |  |  | 12,748 |
Amounts reclassified from accumulated other comprehensive loss | (271) |  |  | 2,701 |  |  | — |  |  | 2,430 |
Net current-period other comprehensive income | 158 |  |  | 2,688 |  |  | 12,332 |  |  | 15,178 |
Balance as of June 30, 2019 | $ | 965 |  |  | $ | (128,692) |  |  | $ | (198,180) |  |  | $ | (325,907) |
Reclassification of Gain/Losses into Income/Expense, Net of Tax | The following table provides information relating to the location in the statements of operations and amount of reclassifications of losses/(gains) in accumulated other comprehensive (loss) income into expense/(income), net of tax, for the three and six months ended June 28, 2020 and June 30, 2019:
| Three Months Ended |  |  |  | Six Months Ended |  |
| June 28, 2020 |  | June 30, 2019 |  | June 28, 2020 |  | June 30, 2019
| (Dollars in thousands) |  |  |  |  |  |
(Gains) losses on foreign exchange contracts: |  |  |  |  |  |  |
Cost of goods sold | $ | (685) |  |  | $ | (179) |  |  | $ | (751) |  |  | $ | (365) |
Total before tax | (685) |  |  | (179) |  |  | (751) |  |  | (365) |
Taxes | 19 |  |  | 71 |  |  | 28 |  |  | 94 |
Net of tax | $ | (666) |  |  | $ | (108) |  |  | $ | (723) |  |  | $ | (271) |
Amortization of pension and other postretirement benefit items (1): |  |  |  |  |  |  |
Actuarial losses | $ | 1,850 |  |  | $ | 1,738 |  |  | $ | 3,702 |  |  | $ | 3,478 |
Prior-service costs | 8 |  |  | 22 |  |  | 16 |  |  | 44 |
Total before tax | 1,858 |  |  | 1,760 |  |  | 3,718 |  |  | 3,522 |
Tax benefit | (433) |  |  | (410) |  |  | (867) |  |  | (821) |
Net of tax | $ | 1,425 |  |  | $ | 1,350 |  |  | $ | 2,851 |  |  | $ | 2,701 |
Total reclassifications, net of tax | $ | 759 |  |  | $ | 1,242 |  |  | $ | 2,128 |  |  | $ | 2,430 |
(1) These accumulated other comprehensive (loss) income components are included in the computation of net benefit expense for pension and other postretirement benefit plans.

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