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Shareholders' equity | 9 Months Ended
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Sep. 30, 2018
Equity [Abstract] |
Shareholders' equity | Shareholders’ equity Basic earnings per share is computed by dividing net income by the weighted average number of common shares outstanding during the period. Diluted earnings per share is computed in the same manner except that the weighted average number of shares is increased to include dilutive securities. The following table provides a reconciliation of basic to diluted weighted average number of common shares outstanding:
| Three Months Ended |  | Nine Months Ended
| September 30, 2018 |  | October 1, 2017 |  | September 30, 2018 |  | October 1, 2017
| (Shares in thousands)
Basic | 45,851 |  |  | 45,035 |  |  | 45,587 |  |  | 44,975 |
Dilutive effect of share-based awards | 919 |  |  | 934 |  |  | 1,007 |  |  | 873 |
Dilutive effect of convertible notes and warrants | 45 |  |  | 618 |  |  | 191 |  |  | 825 |
Diluted | 46,815 |  |  | 46,587 |  |  | 46,785 |  |  | 46,673 |
The weighted average number of shares that were antidilutive and therefore excluded from the calculation of earnings per share were 0.7 million for the three and nine months ended September 30, 2018 and 0.6 million for the three and nine months ended October 1, 2017. In connection with the issuance by the Company in 2010 of $400 million principal amount of convertible notes that matured in August 2017, and as part of hedging arrangements between the Company and two institutional counterparties, the Company issued warrants to the counterparties, entitling them to purchase Company common stock. These transactions are described in greater detail in Note 11 to the consolidated financial statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2017. At September 30, 2018, all of the warrants either (a) were canceled as a result of warrant unwind agreements between the Company and the counterparties or (b) were exercised by the counterparties. The following tables provide information relating to the changes in accumulated other comprehensive loss, net of tax, for the nine months ended September 30, 2018 and October 1, 2017:
| 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, 2017 | $ | 340 |  |  | $ | (138,808 | ) |  | $ | (126,623 | ) |  | $ | (265,091 | )
Other comprehensive income (loss) before reclassifications | 2,816 |  |  | 127 |  |  | (30,130 | ) |  | (27,187 | )
Amounts reclassified from accumulated other comprehensive income | (873 | ) |  | 3,984 |  |  | — |  |  | 3,111 |
Net current-period other comprehensive income (loss) | 1,943 |  |  | 4,111 |  |  | (30,130 | ) |  | (24,076 | )
Balance as of September 30, 2018 | $ | 2,283 |  |  | $ | (134,697 | ) |  | $ | (156,753 | ) |  | $ | (289,167 | )
| 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 (loss) before reclassifications | 3,383 |  |  | (1,050 | ) |  | 156,012 |  |  | 158,345 |
Amounts reclassified from accumulated other comprehensive loss | 1,535 |  |  | 3,387 |  |  | — |  |  | 4,922 |
Net current-period other comprehensive income | 4,918 |  |  | 2,337 |  |  | 156,012 |  |  | 163,267 |
Balance as of October 1, 2017 | $ | 2,494 |  |  | $ | (134,259 | ) |  | $ | (143,685 | ) |  | $ | (275,450 | )
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 30, 2018 and October 1, 2017:
| Three Months Ended |  | Nine Months Ended
| September 30, 2018 |  | October 1, 2017 |  | September 30, 2018 |  | October 1, 2017
| (Dollars in thousands)
(Gains) losses on foreign exchange contracts: |  |  |  |  |  |  |
Cost of goods sold | $ | (87 | ) |  | $ | (1,179 | ) |  | $ | (1,038 | ) |  | $ | 1,769 |
Total before tax | (87 | ) |  | (1,179 | ) |  | (1,038 | ) |  | 1,769 |
Taxes (benefit) | 25 |  |  | 237 |  |  | 165 |  |  | (234 | )
Net of tax | $ | (62 | ) |  | $ | (942 | ) |  | $ | (873 | ) |  | $ | 1,535 |
Amortization of pension and other postretirement benefit items (1):
Actuarial losses | $ | 1,640 |  |  | $ | 1,723 |  |  | $ | 5,120 |  |  | $ | 5,176 |
Prior-service costs | 24 |  |  | 20 |  |  | 71 |  |  | 79 |
Total before tax | 1,664 |  |  | 1,743 |  |  | 5,191 |  |  | 5,255 |
Tax benefit | (388 | ) |  | (619 | ) |  | (1,207 | ) |  | (1,868 | )
Net of tax | $ | 1,276 |  |  | $ | 1,124 |  |  | $ | 3,984 |  |  | $ | 3,387 |
Total reclassifications, net of tax | $ | 1,214 |  |  | $ | 182 |  |  | $ | 3,111 |  |  | $ | 4,922 |
(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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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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