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Shareholders' equity (Tables) | 12 Months Ended
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Dec. 31, 2016
Equity [Abstract] |
Schedule of Weighted Average Number of Shares | The following table provides a reconciliation of basic to diluted weighted average shares outstanding:
| 2016 |  | 2015 |  | 2014
| (Shares in thousands)
Basic | 43,325 |  |  | 41,558 |  |  | 41,366 |
Dilutive effect of share based awards | 570 |  |  | 488 |  |  | 450 |
Dilutive effect of 3.875% Convertible Notes and warrants | 3,751 |  |  | 6,012 |  |  | 4,654 |
Diluted | 47,646 |  |  | 48,058 |  |  | 46,470 |
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, 2016 and 2015:
| 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, 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 (loss) | 483 |  |  | 4,133 |  |  | — |  |  | 4,616 |
Net current-year other comprehensive income (loss) | (2,491 | ) |  | 2,857 |  |  | (110,595 | ) |  | (110,229 | )
Balance at December 31, 2015 | (2,491 | ) |  | (138,887 | ) |  | (229,746 | ) |  | (371,124 | )
Other comprehensive income (loss) before reclassifications | (3,434 | ) |  | (2,221 | ) |  | (69,119 | ) |  | (74,774 | )
Amounts reclassified from accumulated other comprehensive income | 3,501 |  |  | 4,512 |  |  | — |  |  | 8,013 |
Net current-year other comprehensive (loss) income | 67 |  |  | 2,291 |  |  | (69,119 | ) |  | (66,761 | )
Reclassification related to acquisition of noncontrolling interest | — |  |  | — |  |  | (832 | ) |  | (832 | )
Balance at December 31, 2016 | $ | (2,424 | ) |  | $ | (136,596 | ) |  | $ | (299,697 | ) |  | $ | (438,717 | )
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, 2016, 2015 and 2014 :
| December 31, 2016 |  | December 31, 2015 |  | December 31, 2014
| (Dollars in thousands)
Losses (gains) on designated foreign exchange contracts: |  |  |  |  |
Cost of goods sold | $ | 4,511 |  |  | $ | 679 |  |  | $ | (705 | )
Total before tax | 4,511 |  |  | 679 |  |  | (705 | )
Taxes | (1,010 | ) |  | (196 | ) |  | 111 |
Net of tax | $ | 3,501 |  |  | $ | 483 |  |  | $ | (594 | )
Amortization of pension and other postretirement benefits items: |  |  |  |  |
Actuarial losses (1) | $ | 6,965 |  |  | $ | 6,375 |  |  | $ | 4,385 |
Prior-service credits (1) | 56 |  |  | — |  |  | (21 | )
Total before tax | 7,021 |  |  | 6,375 |  |  | 4,364 |
Tax benefit | (2,509 | ) |  | (2,242 | ) |  | (1,535 | )
Net of tax | $ | 4,512 |  |  | $ | 4,133 |  |  | $ | 2,829 |
Total reclassifications, net of tax | $ | 8,013 |  |  | $ | 4,616 |  |  | $ | 2,235 |
(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 for additional information).

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