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Shareholders' equity (Tables) | 3 Months Ended
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Apr. 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 shares outstanding:
| Three Months Ended
| April 2, 2017 |  | March 27, 2016
| (Shares in thousands)
Basic | 44,893 |  |  | 41,647 |
Dilutive effect of share-based awards | 821 |  |  | 519 |
Dilutive effect of 3.875% Convertible Notes and warrants (1) | 901 |  |  | 6,616 |
Diluted | 46,615 |  |  | 48,782 |
(1) | The reduction in the dilutive effect of the Convertible Notes and warrants at April 2, 2017 as compared to March 27, 2016 is due to the Company’s repurchase of Convertible Notes and conversions by holders of the Convertible Notes subsequent to March 27, 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 three months ended April 2, 2017 and March 27, 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 | 350 |  |  | (241 | ) |  | 46,982 |  |  | 47,091 |
Amounts reclassified from accumulated other comprehensive income | 1,378 |  |  | 1,131 |  |  | — |  |  | 2,509 |
Net current-period other comprehensive income | 1,728 |  |  | 890 |  |  | 46,982 |  |  | 49,600 |
Balance as of April 2, 2017 | $ | (696 | ) |  | $ | (135,706 | ) |  | $ | (252,715 | ) |  | $ | (389,117 | )
| 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 | (50 | ) |  | 182 |  |  | 20,476 |  |  | 20,608 |
Amounts reclassified from accumulated other comprehensive loss | 1,530 |  |  | 1,056 |  |  | — |  |  | 2,586 |
Net current-period other comprehensive income | 1,480 |  |  | 1,238 |  |  | 20,476 |  |  | 23,194 |
Balance at March 27, 2016 | $ | (1,011 | ) |  | $ | (137,649 | ) |  | $ | (209,270 | ) |  | $ | (347,930 | )
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 months ended April 2, 2017 and March 27, 2016:
| Three Months Ended
| April 2, 2017 |  | March 27, 2016
| (Dollars in thousands)
Losses on foreign exchange contracts: |  |  |
Cost of goods sold | $ | 1,645 |  |  | $ | 1,871 |
Total before tax | 1,645 |  |  | 1,871 |
Tax benefit | (267 | ) |  | (341 | )
Net of tax | $ | 1,378 |  |  | $ | 1,530 |
Amortization of pension and other postretirement benefit items: |  |  |
Actuarial losses (1) | $ | 1,726 |  |  | $ | 1,622 |
Prior-service costs(1) | 29 |  |  | 14 |
Total before tax | 1,755 |  |  | 1,636 |
Tax benefit | (624 | ) |  | (580 | )
Net of tax | $ | 1,131 |  |  | $ | 1,056 |
Total reclassifications, net of tax | $ | 2,509 |  |  | $ | 2,586 |
(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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