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Changes in shareholders' equity (Tables) | 9 Months Ended
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Sep. 25, 2016
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 |  | Nine Months Ended
| September 25, 2016 |  | September 27, 2015 |  | September 25, 2016 |  | September 27, 2015
| (Shares in thousands)
Basic | 44,045 |  |  | 41,597 |  |  | 43,081 |  |  | 41,542 |
Dilutive effect of share-based awards | 639 |  |  | 511 |  |  | 574 |  |  | 483 |
Dilutive effect of 3.875% Convertible Notes and warrants | 2,762 |  |  | 6,424 |  |  | 4,169 |  |  | 5,944 |
Diluted | 47,446 |  |  | 48,532 |  |  | 47,824 |  |  | 47,969 |
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 25, 2016 and September 27, 2015:
| 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, 2015 | $ | (2,491 | ) |  | $ | (138,887 | ) |  | $ | (229,746 | ) |  | $ | (371,124 | )
Other comprehensive income (loss) before reclassifications | (2,255 | ) |  | 618 |  |  | 11,131 |  |  | 9,494 |
Amounts reclassified from accumulated other comprehensive income | 3,016 |  |  | 3,296 |  |  | — |  |  | 6,312 |
Net current-period other comprehensive income | 761 |  |  | 3,914 |  |  | 11,131 |  |  | 15,806 |
Reclassification related to acquisition of noncontrolling interest | — |  |  | — |  |  | (832 | ) |  | (832 | )
Balance as of September 25, 2016 | $ | (1,730 | ) |  | $ | (134,973 | ) |  | $ | (219,447 | ) |  | $ | (356,150 | )
| 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, 2014 | $ | — |  |  | $ | (141,744 | ) |  | $ | (119,151 | ) |  | $ | (260,895 | )
Other comprehensive (loss) before reclassifications | (2,599 | ) |  | 465 |  |  | (91,137 | ) |  | (93,271 | )
Amounts reclassified from accumulated other comprehensive loss | 1,110 |  |  | 3,157 |  |  | — |  |  | 4,267 |
Net current-period other comprehensive (loss) income | (1,489 | ) |  | 3,622 |  |  | (91,137 | ) |  | (89,004 | )
Balance at September 27, 2015 | $ | (1,489 | ) |  | $ | (138,122 | ) |  | $ | (210,288 | ) |  | $ | (349,899 | )
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 25, 2016 and September 27, 2015:
| Three Months Ended |  | Nine Months Ended
| September 25, 2016 |  | September 27, 2015 |  | September 25, 2016 |  | September 27, 2015
| (Dollars in thousands)
Losses on foreign exchange contracts: |  |  |  |  |  |  |
Cost of goods sold | $ | 535 |  |  | $ | 1,168 |  |  | $ | 3,907 |  |  | $ | 1,431 |
Total before tax | 535 |  |  | 1,168 |  |  | 3,907 |  |  | 1,431 |
Tax benefit | (187 | ) |  | (221 | ) |  | (891 | ) |  | (321 | )
Net of tax | $ | 348 |  |  | $ | 947 |  |  | $ | 3,016 |  |  | $ | 1,110 |
Amortization of pension and other postretirement benefit items: |  |  |  |  |  |  |
Actuarial losses (1) | $ | 1,829 |  |  | $ | 1,571 |  |  | $ | 5,071 |  |  | $ | 4,782 |
Prior-service costs(1) | 15 |  |  | — |  |  | 43 |  |  | — |
Total before tax | 1,844 |  |  | 1,571 |  |  | 5,114 |  |  | 4,782 |
Tax benefit | (657 | ) |  | (551 | ) |  | (1,818 | ) |  | (1,625 | )
Net of tax | $ | 1,187 |  |  | $ | 1,020 |  |  | $ | 3,296 |  |  | $ | 3,157 |
Total reclassifications, net of tax | $ | 1,535 |  |  | $ | 1,967 |  |  | $ | 6,312 |  |  | $ | 4,267 |
(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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