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Shareholders' equity (Tables) | 6 Months Ended
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Jun. 30, 2019
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 30, 2019 |  | July 1, 2018 |  | June 30, 2019 |  | July 1, 2018
| (Shares in thousands)
Basic | 46,172 |  |  | 45,581 |  |  | 46,111 |  |  | 45,455 |
Dilutive effect of share-based awards | 864 |  |  | — |  |  | 878 |  |  | 1,052 |
Dilutive effect of convertible warrants | — |  |  | — |  |  | — |  |  | 264 |
Diluted | 47,036 |  |  | 45,581 |  |  | 46,989 |  |  | 46,771 |
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 30, 2019 and July 1, 2018:
| 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 income | (271 | ) |  | 2,701 |  |  | — |  |  | 2,430 |
Net current-period other comprehensive income (loss) | 158 |  |  | 2,688 |  |  | 12,332 |  |  | 15,178 |
Balance as of June 30, 2019 | $ | 965 |  |  | $ | (128,692 | ) |  | $ | (198,180 | ) |  | $ | (325,907 | )
| 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, 2017 | $ | 340 |  |  | $ | (138,808 | ) |  | $ | (126,623 | ) |  | $ | (265,091 | )
Other comprehensive (loss) before reclassifications | 1,103 |  |  | 188 |  |  | (44,517 | ) |  | (43,226 | )
Amounts reclassified from accumulated other comprehensive loss | (811 | ) |  | 2,708 |  |  | — |  |  | 1,897 |
Net current-period other comprehensive income | 292 |  |  | 2,896 |  |  | (44,517 | ) |  | (41,329 | )
Balance as of July 1, 2018 | $ | 632 |  |  | $ | (135,912 | ) |  | $ | (171,140 | ) |  | $ | (306,420 | )
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 30, 2019 and July 1, 2018:
| Three Months Ended |  | Six Months Ended
| June 30, 2019 |  | July 1, 2018 |  | June 30, 2019 |  | July 1, 2018
| (Dollars in thousands)
(Gains) losses on foreign exchange contracts: |  |  |  |  |  |  |
Cost of goods sold | $ | (179 | ) |  | $ | (118 | ) |  | $ | (365 | ) |  | $ | (951 | )
Total before tax | (179 | ) |  | (118 | ) |  | (365 | ) |  | (951 | )
Taxes (benefit) | 71 |  |  | 27 |  |  | 94 |  |  | 140 |
Net of tax | (108 | ) |  | (91 | ) |  | (271 | ) |  | (811 | )
Losses (gains) on cross-currency swaps (net investment hedge): |  |  |  |  |  |  |
Interest expense | (4,917 | ) |  | $ | — |  |  | (8,799 | ) |  | $ | — |
Total before tax | (4,917 | ) |  | — |  |  | (8,799 | ) |  | — |
Tax expense | 1,111 |  |  | — |  |  | 2,040 |  |  | — |
Net of tax | (3,806 | ) |  | $ | — |  |  | (6,759 | ) |  | $ | — |
Amortization of pension and other postretirement benefit items (1):
Actuarial losses | 1,738 |  |  | 1,734 |  |  | 3,478 |  |  | 3,480 |
Prior-service costs | 22 |  |  | 23 |  |  | 44 |  |  | 47 |
Total before tax | 1,760 |  |  | 1,757 |  |  | 3,522 |  |  | 3,527 |
Tax benefit | (410 | ) |  | (408 | ) |  | (821 | ) |  | (819 | )
Net of tax | 1,350 |  |  | 1,349 |  |  | 2,701 |  |  | 2,708 |
Total reclassifications, net of tax | $ | (2,564 | ) |  | $ | 1,258 |  |  | $ | (4,329 | ) |  | $ | 1,897 |
(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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