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Shareholders' equity (Tables) | 6 Months Ended
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Jul. 02, 2017
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
| July 2, 2017 |  | June 26, 2016 |  | July 2, 2017 |  | June 26, 2016
| (Shares in thousands)
Basic | 44,996 |  |  | 43,549 |  |  | 44,945 |  |  | 42,598 |
Dilutive effect of share-based awards | 866 |  |  | 566 |  |  | 843 |  |  | 543 |
Dilutive effect of 3.875% Convertible Notes and warrants (1) | 956 |  |  | 3,131 |  |  | 928 |  |  | 4,873 |
Diluted | 46,818 |  |  | 47,246 |  |  | 46,716 |  |  | 48,014 |
(1) | The reduction in the dilutive effect of the Convertible Notes and warrants during the three and six months ended July 2, 2017 as compared to three and six months ended June 26, 2016 is due principally to the Company’s repurchase of Convertible Notes and conversions by holders of the Convertible Notes during and subsequent to the three month period ended June 26, 2016.
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 July 2, 2017 and June 26, 2016:
| 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 income (loss) before reclassifications | 2,684 |  |  | (669 | ) |  | 112,667 |  |  | 114,682 |
Amounts reclassified from accumulated other comprehensive income | 2,477 |  |  | 2,263 |  |  | — |  |  | 4,740 |
Net current-period other comprehensive income | 5,161 |  |  | 1,594 |  |  | 112,667 |  |  | 119,422 |
Balance as of July 2, 2017 | $ | 2,737 |  |  | $ | (135,002 | ) |  | $ | (187,030 | ) |  | $ | (319,295 | )
| Cash Flow Hedges |  | Pension and Other Postretirement Benefit Plans |  | Foreign Currency Translation Adjustment |  | Accumulated Other Comprehensive (Loss) Income
| (Dollars in thousands)
Balance at December 31, 2015 | $ | (2,491 | ) |  | $ | (138,887 | ) |  | $ | (229,746 | ) |  | $ | (371,124 | )
Other comprehensive (loss) before reclassifications | (1,684 | ) |  | 375 |  |  | 11,285 |  |  | 9,976 |
Amounts reclassified from accumulated other comprehensive loss | 2,668 |  |  | 2,109 |  |  | — |  |  | 4,777 |
Net current-period other comprehensive income | 984 |  |  | 2,484 |  |  | 11,285 |  |  | 14,753 |
Balance at June 26, 2016 | $ | (1,507 | ) |  | $ | (136,403 | ) |  | $ | (218,461 | ) |  | $ | (356,371 | )
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 July 2, 2017 and June 26, 2016:
| Three Months Ended |  | Six Months Ended
| July 2, 2017 |  | June 26, 2016 |  | July 2, 2017 |  | June 26, 2016
| (Dollars in thousands)
Losses on foreign exchange contracts: |  |  |  |  |  |  |
Cost of goods sold | $ | 1,303 |  |  | $ | 1,501 |  |  | $ | 2,948 |  |  | $ | 3,372 |
Total before tax | 1,303 |  |  | 1,501 |  |  | 2,948 |  |  | 3,372 |
Tax benefit | (204 | ) |  | (363 | ) |  | (471 | ) |  | (704 | )
Net of tax | $ | 1,099 |  |  | $ | 1,138 |  |  | $ | 2,477 |  |  | $ | 2,668 |
Amortization of pension and other postretirement benefit items:
Actuarial losses (1) | $ | 1,727 |  |  | $ | 1,620 |  |  | $ | 3,453 |  |  | $ | 3,242 |
Prior-service costs(1) | 30 |  |  | 14 |  |  | 59 |  |  | 28 |
Total before tax | 1,757 |  |  | 1,634 |  |  | 3,512 |  |  | 3,270 |
Tax benefit | (625 | ) |  | (581 | ) |  | (1,249 | ) |  | (1,161 | )
Net of tax | $ | 1,132 |  |  | $ | 1,053 |  |  | $ | 2,263 |  |  | $ | 2,109 |
Total reclassifications, net of tax | $ | 2,231 |  |  | $ | 2,191 |  |  | $ | 4,740 |  |  | $ | 4,777 |
(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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