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Shareholders' equity (Tables) | 12 Months Ended
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Dec. 31, 2015
Equity [Abstract] |
Schedule of Weighted Average Number of Shares | The following table provides a reconciliation of basic to diluted weighted average shares outstanding:
| 2015 |  | 2014 |  | 2013
| (Shares in thousands)
Basic | 41,558 |  |  | 41,366 |  |  | 41,105 |
Dilutive effect of share based awards | 488 |  |  | 450 |  |  | 410 |
Dilutive effect of 3.875% Convertible Notes and warrants | 6,012 |  |  | 4,654 |  |  | 2,178 |
Diluted | 48,058 |  |  | 46,470 |  |  | 43,693 |
Schedule of Accumulated Other Comprehensive Income (Loss) | The following tables provide information relating to the changes in accumulated other comprehensive income (loss), net of tax, for the years ended December 31, 2015 and 2014:
| 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, 2013 | $ | — |  |  | $ | (97,037 | ) |  | $ | (13,818 | ) |  | $ | (110,855 | )
Other comprehensive income (loss) before reclassifications | 594 |  |  | (47,536 | ) |  | (105,333 | ) |  | (152,275 | )
Amounts reclassified from accumulated other comprehensive income (loss) | (594 | ) |  | 2,829 |  |  | — |  |  | 2,235 |
Net current-year other comprehensive income (loss) | — |  |  | (44,707 | ) |  | (105,333 | ) |  | (150,040 | )
Balance at December 31, 2014 | — |  |  | (141,744 | ) |  | (119,151 | ) |  | (260,895 | )
Other comprehensive income (loss) before reclassifications | (2,974 | ) |  | (1,276 | ) |  | (110,595 | ) |  | (114,845 | )
Amounts reclassified from accumulated other comprehensive income | 483 |  |  | 4,133 |  |  | — |  |  | 4,616 |
Net current-year other comprehensive (loss) income | (2,491 | ) |  | 2,857 |  |  | (110,595 | ) |  | (110,229 | )
Balance at December 31, 2015 | $ | (2,491 | ) |  | $ | (138,887 | ) |  | $ | (229,746 | ) |  | $ | (371,124 | )
Reclassification out of Accumulated Other Comprehensive Income | The following table provides information relating to the reclassifications of losses/(gains) in accumulated other comprehensive (loss) income into expense/(income), net of tax, for the years ended December 31, 2015, 2014 and 2013 :
| December 31, 2015 |  | December 31, 2014 |  | December 31, 2013
| (Dollars in thousands)
Losses (gains) on foreign exchange contracts: |  |  |  |  |
Cost of goods sold | $ | 679 |  |  | $ | (705 | ) |  | $ | 884 |
Total before tax | 679 |  |  | (705 | ) |  | 884 |
Taxes | (196 | ) |  | 111 |  |  | 46 |
Net of tax | $ | 483 |  |  | $ | (594 | ) |  | $ | 930 |
Amortization of pension and other postretirement benefits items: |  |  |  |  |
Actuarial losses (1) | $ | 6,375 |  |  | $ | 4,385 |  |  | $ | 7,211 |
Prior-service credits (1) | — |  |  | (21 | ) |  | (21 | )
Transition obligation | — |  |  | — |  |  | 5 |
Total before tax | 6,375 |  |  | 4,364 |  |  | 7,195 |
Tax benefit | (2,242 | ) |  | (1,535 | ) |  | (2,439 | )
Net of tax | $ | 4,133 |  |  | $ | 2,829 |  |  | $ | 4,756 |
Total reclassifications, net of tax | $ | 4,616 |  |  | $ | 2,235 |  |  | $ | 5,686 |
(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 14 to the consolidated financial statements for additional information).

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