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Shareholders' equity (Tables) | 9 Months Ended
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Sep. 30, 2018
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 |  | Nine Months Ended
| September 30, 2018 |  | October 1, 2017 |  | September 30, 2018 |  | October 1, 2017
| (Shares in thousands)
Basic | 45,851 |  |  | 45,035 |  |  | 45,587 |  |  | 44,975 |
Dilutive effect of share-based awards | 919 |  |  | 934 |  |  | 1,007 |  |  | 873 |
Dilutive effect of convertible notes and warrants | 45 |  |  | 618 |  |  | 191 |  |  | 825 |
Diluted | 46,815 |  |  | 46,587 |  |  | 46,785 |  |  | 46,673 |
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 nine months ended September 30, 2018 and October 1, 2017:
| 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 income (loss) before reclassifications | 2,816 |  |  | 127 |  |  | (30,130 | ) |  | (27,187 | )
Amounts reclassified from accumulated other comprehensive income | (873 | ) |  | 3,984 |  |  | — |  |  | 3,111 |
Net current-period other comprehensive income (loss) | 1,943 |  |  | 4,111 |  |  | (30,130 | ) |  | (24,076 | )
Balance as of September 30, 2018 | $ | 2,283 |  |  | $ | (134,697 | ) |  | $ | (156,753 | ) |  | $ | (289,167 | )
| 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, 2016 | $ | (2,424 | ) |  | $ | (136,596 | ) |  | $ | (299,697 | ) |  | $ | (438,717 | )
Other comprehensive (loss) before reclassifications | 3,383 |  |  | (1,050 | ) |  | 156,012 |  |  | 158,345 |
Amounts reclassified from accumulated other comprehensive loss | 1,535 |  |  | 3,387 |  |  | — |  |  | 4,922 |
Net current-period other comprehensive income | 4,918 |  |  | 2,337 |  |  | 156,012 |  |  | 163,267 |
Balance as of October 1, 2017 | $ | 2,494 |  |  | $ | (134,259 | ) |  | $ | (143,685 | ) |  | $ | (275,450 | )
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 nine months ended September 30, 2018 and October 1, 2017:
| Three Months Ended |  | Nine Months Ended
| September 30, 2018 |  | October 1, 2017 |  | September 30, 2018 |  | October 1, 2017
| (Dollars in thousands)
(Gains) losses on foreign exchange contracts: |  |  |  |  |  |  |
Cost of goods sold | $ | (87 | ) |  | $ | (1,179 | ) |  | $ | (1,038 | ) |  | $ | 1,769 |
Total before tax | (87 | ) |  | (1,179 | ) |  | (1,038 | ) |  | 1,769 |
Taxes (benefit) | 25 |  |  | 237 |  |  | 165 |  |  | (234 | )
Net of tax | $ | (62 | ) |  | $ | (942 | ) |  | $ | (873 | ) |  | $ | 1,535 |
Amortization of pension and other postretirement benefit items (1):
Actuarial losses | $ | 1,640 |  |  | $ | 1,723 |  |  | $ | 5,120 |  |  | $ | 5,176 |
Prior-service costs | 24 |  |  | 20 |  |  | 71 |  |  | 79 |
Total before tax | 1,664 |  |  | 1,743 |  |  | 5,191 |  |  | 5,255 |
Tax benefit | (388 | ) |  | (619 | ) |  | (1,207 | ) |  | (1,868 | )
Net of tax | $ | 1,276 |  |  | $ | 1,124 |  |  | $ | 3,984 |  |  | $ | 3,387 |
Total reclassifications, net of tax | $ | 1,214 |  |  | $ | 182 |  |  | $ | 3,111 |  |  | $ | 4,922 |
(1) These accumulated other comprehensive (loss) income components are included in the computation of net benefit expense for pension and other postretirement benefit plans (see Note 12 for additional information).

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