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Supplementary Balance Sheet Detail | 12 Months Ended
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Dec. 31, 2022
Balance Sheet Related Disclosures [Abstract] |
Supplementary Balance Sheet Detail | Supplementary Balance Sheet Detail The following tables present supplementary balance sheet details:
| December 31, 2022 |  | December 31, 2021
| (Dollars in thousands)
Inventories: |  |  |
Raw materials and supplies | $ | 216,761 |  |  | $ | 132,113 |
Work in process | 192,821 |  |  | 127,127 |
Finished goods | 38,159 |  |  | 30,192 |
| $ | 447,741 |  |  | $ | 289,432 |
Prepaid expenses and other current assets: |  |  |
Prepaid expenses | $ | 15,261 |  |  | $ | 8,193 |
Value-added tax and other indirect taxes receivable | 39,417 |  |  | 40,861 |
Spare parts inventory | 12,990 |  |  | 12,408 |
Other current assets | 19,604 |  |  | 11,902 |
| $ | 87,272 |  |  | $ | 73,364 |
Property, plant and equipment: |  |  |
Land and improvements | $ | 48,478 |  |  | $ | 49,201 |
Buildings | 82,054 |  |  | 79,660 |
Machinery and equipment and other | 655,823 |  |  | 621,808 |
Construction in progress | 82,813 |  |  | 64,629 |
| $ | 869,168 |  |  | $ | 815,298 |
Other accrued liabilities: |  |  |
Payrolls (including incentive programs) | $ | 10,799 |  |  | $ | 16,904 |
Employee benefits | 6,921 |  |  | 7,272 |
Deferred revenue | 27,878 |  |  | 9,840 |
Other | 43,751 |  |  | 22,389 |
| $ | 89,349 |  |  | $ | 56,405 |
Other long-term obligations: |  |  |
Post-employment benefits | $ | 11,996 |  |  | $ | 14,597 |
Pension and related benefits | 22,768 |  |  | 31,139 |
Other | 16,058 |  |  | 22,921 |
| $ | 50,822 |  |  | $ | 68,657 |
The following table presents an analysis of the allowance for doubtful accounts for the years ended December 31:
| 2022 |  | 2021 |  | 2020
| (Dollars in thousands)
Balance at beginning of year | $ | 6,835 |  |  | $ | 8,243 |  |  | $ | 5,474 |
Charge to retained earnings - ASC 326 adoption impact | — |  |  | — |  |  | 2,026 |
Charge (credit) to income | 1,585 |  |  | (1,266) |  |  | 1,458 |
Deductions | (401) |  |  | (142) |  |  | (715) |
Balance at end of year | $ | 8,019 |  |  | $ | 6,835 |  |  | $ | 8,243 |

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI https://asc.fasb.org/topic&trid=2122208 + Details
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