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Shareholders' equity (Tables) | 12 Months Ended
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Dec. 31, 2018
Equity [Abstract] |
Schedule of Weighted Average Number of Shares | The following table provides a reconciliation of basic to diluted weighted average shares outstanding:
| 2018 |  | 2017 |  | 2016
| (Shares in thousands)
Basic | 45,689 |  |  | 45,004 |  |  | 43,325 |
Dilutive effect of share based awards | 970 |  |  | 923 |  |  | 570 |
Dilutive effect of convertible notes and warrants | 142 |  |  | 737 |  |  | 3,751 |
Diluted | 46,801 |  |  | 46,664 |  |  | 47,646 |
Schedule of Accumulated Other Comprehensive Income (Loss) | The following tables provides information relating to the changes in accumulated other comprehensive income (loss), net of tax, for the years ended December 31, 2018 and 2017:
| Cash Flow Hedges |  | Pension and Other Postretirement Benefit Plans |  | Foreign Currency Translation Adjustment |  | Accumulated Other Comprehensive Income (Loss)
| (Dollars in thousands)
Balance at December 31, 2016 | $ | (2,424 | ) |  | $ | (136,596 | ) |  | $ | (299,697 | ) |  | $ | (438,717 | )
Other comprehensive income (loss) before reclassifications | 2,775 |  |  | (6,725 | ) |  | 173,074 |  |  | 169,124 |
Amounts reclassified from accumulated other comprehensive income (loss) | (11 | ) |  | 4,513 |  |  | — |  |  | 4,502 |
Net current-year other comprehensive income (loss) | 2,764 |  |  | (2,212 | ) |  | 173,074 |  |  | 173,626 |
Balance at December 31, 2017 | 340 |  |  | (138,808 | ) |  | (126,623 | ) |  | (265,091 | )
Other comprehensive income (loss) before reclassifications | 2,574 |  |  | 1,605 |  |  | (83,889 | ) |  | (79,710 | )
Amounts reclassified from accumulated other comprehensive income | (2,107 | ) |  | 5,823 |  |  | — |  |  | 3,716 |
Net current-year other comprehensive (loss) income | 467 |  |  | 7,428 |  |  | (83,889 | ) |  | (75,994 | )
Balance at December 31, 2018 | $ | 807 |  |  | $ | (131,380 | ) |  | $ | (210,512 | ) |  | $ | (341,085 | )
Reclassification out of Accumulated Other Comprehensive Income | The following table provides information relating to the losses (gains) recognized in the statements of income including the reclassifications of losses (gains) in accumulated other comprehensive (loss) income into expense/(income), net of tax, for the years ended December 31, 2018, 2017 and 2016:
| December 31, 2018 |  | December 31, 2017 |  | December 31, 2016
| (Dollars in thousands)
Losses (gains) on designated foreign exchange forward contracts: |  |  |  |  |
Cost of goods sold | $ | (2,270 | ) |  | $ | (95 | ) |  | $ | 4,511 |
Total before tax | (2,270 | ) |  | (95 | ) |  | 4,511 |
Taxes expense (benefit) | 163 |  |  | 84 |  |  | (1,010 | )
Net of tax | $ | (2,107 | ) |  | $ | (11 | ) |  | $ | 3,501 |
Losses (gains) on cross-currency swaps (net investment hedge): |  |  |  |  |
Interest expense | $ | (3,277 | ) |  | $ | — |  |  | $ | — |
Total before tax | (3,277 | ) |  | — |  |  | — |
Tax expense | 754 |  |  | — |  |  | — |
Net of tax | $ | (2,523 | ) |  | $ | — |  |  | $ | — |
Amortization of pension and other postretirement benefits items: |  |  |  |  |
Actuarial losses (1) | $ | 7,305 |  |  | $ | 6,904 |  |  | $ | 6,965 |
Prior-service credits (1) | 251 |  |  | 105 |  |  | 56 |
Total before tax | 7,556 |  |  | 7,009 |  |  | 7,021 |
Tax benefit | (1,733 | ) |  | (2,496 | ) |  | (2,509 | )
Net of tax | $ | 5,823 |  |  | $ | 4,513 |  |  | $ | 4,512 |
Impact on income from continuing operations, net of tax | $ | 1,193 |  |  | $ | 4,502 |  |  | $ | 8,013 |
(1) | These accumulated other comprehensive (loss) income components are included in the computation of net benefit cost of pension and other postretirement benefit plans (see Note 15 for additional information).

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