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Supplementary Balance Sheet Detail (Tables) | 12 Months Ended
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Dec. 31, 2023
Balance Sheet Related Disclosures [Abstract] |
Schedule Of Amounts Recognized In Balance Sheet | The following tables present supplementary balance sheet details:
| December 31, 2023 |  | December 31, 2022
| (Dollars in thousands)
Inventories: |  |  |
Raw materials and supplies | $ | 109,084 |  |  | $ | 216,761 |
Work in process | 186,473 |  |  | 192,821 |
Finished goods | 34,589 |  |  | 38,159 |
| $ | 330,146 |  |  | $ | 447,741 |
Prepaid expenses and other current assets: |  |  |
Prepaid expenses | $ | 11,176 |  |  | $ | 15,261 |
Value-added tax and other indirect taxes receivable | 28,629 |  |  | 39,417 |
Spare parts inventory | 15,242 |  |  | 12,990 |
Other current assets | 11,335 |  |  | 19,604 |
| $ | 66,382 |  |  | $ | 87,272 |
Property, plant and equipment: |  |  |
Land and improvements | $ | 49,962 |  |  | $ | 48,478 |
Buildings | 87,820 |  |  | 82,054 |
Machinery and equipment and other | 717,002 |  |  | 655,823 |
Construction in progress | 65,660 |  |  | 82,813 |
| $ | 920,444 |  |  | $ | 869,168 |
Other accrued liabilities: |  |  |
Payrolls (including incentive programs) | $ | 22,369 |  |  | $ | 10,799 |
Employee benefits | 7,018 |  |  | 6,921 |
Deferred revenue | 31,583 |  |  | 27,878 |
Other | 30,732 |  |  | 43,751 |
| $ | 91,702 |  |  | $ | 89,349 |
Other long-term obligations: |  |  |
Post-employment benefits | $ | 12,613 |  |  | $ | 11,996 |
Pension and related benefits | 26,068 |  |  | 22,768 |
Other | 16,964 |  |  | 16,058 |
| $ | 55,645 |  |  | $ | 50,822 |
Schedule Of Analysis Of The Allowance For Doubtful Accounts | The following table presents an analysis of the allowance for doubtful accounts for the years ended December 31:
| 2023 |  | 2022 |  | 2021
| (Dollars in thousands)
Balance at beginning of year | $ | 8,019 |  |  | $ | 6,835 |  |  | $ | 8,243 |
(Credit) charge to income | (439) |  |  | 1,585 |  |  | (1,266) |
Deductions | 128 |  |  | (401) |  |  | (142) |
Balance at end of year | $ | 7,708 |  |  | $ | 8,019 |  |  | $ | 6,835 |
Supplier Finance Program | See below for a rollforward of our SFP obligations.
| (Dollars in thousands)
Confirmed obligations outstanding as of December 31, 2022 | $ | — |
Invoices confirmed during the year | 24,368 |
Confirmed invoices paid during the year | (19,732) |
Confirmed obligations outstanding as of December 31, 2023 | $ | 4,636 |

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