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Supplementary Balance Sheet Detail | 12 Months Ended
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Dec. 31, 2021
Balance Sheet Related Disclosures [Abstract] |
Supplementary Balance Sheet Detail | Supplementary Balance Sheet Detail The following tables present supplementary balance sheet details:
| As of December 31, 2021 |  | As of December 31, 2020
| (Dollars in thousands)
Inventories: |  |  |
Raw materials and supplies | $ | 132,113 |  |  | $ | 101,098 |
Work in process | 127,127 |  |  | 110,331 |
Finished goods | 30,192 |  |  | 54,535 |
| $ | 289,432 |  |  | $ | 265,964 |
Prepaid expenses and other current assets: |  |  |
Prepaid expenses | $ | 8,193 |  |  | $ | 9,242 |
Value-added tax and other indirect taxes receivable* | 40,861 |  |  | 10,666 |
Spare parts inventory | 12,408 |  |  | 11,825 |
Other current assets | 11,902 |  |  | 3,381 |
| $ | 73,364 |  |  | $ | 35,114 |
Property, plant and equipment: |  |  |
Land and improvements | $ | 49,201 |  |  | $ | 50,285 |
Buildings | 79,660 |  |  | 80,041 |
Machinery and equipment and other | 621,808 |  |  | 621,478 |
Construction in progress | 64,629 |  |  | 33,098 |
| $ | 815,298 |  |  | $ | 784,902 |
Other accrued liabilities: |  |  |
Payrolls (including incentive programs) | $ | 16,904 |  |  | $ | 13,159 |
Employee benefits | 7,272 |  |  | 7,128 |
Deferred revenue | 9,840 |  |  | 13,056 |
Other | 22,389 |  |  | 23,158 |
| $ | 56,405 |  |  | $ | 56,501 |
Other long-term obligations: |  |  |
Post-employment benefits | $ | 14,597 |  |  | $ | 15,669 |
Pension and related benefits | 31,139 |  |  | 37,847 |
Other | 22,921 |  |  | 27,962 |
| $ | 68,657 |  |  | $ | 81,478 |
*Included in "Value-added tax and other indirect taxes receivable" is the recognition of the Brazil value-added tax credit of $11.5 million (see Note 16, "Other (Income) Expense, net"). The following table presents an analysis of the allowance for doubtful accounts:
| 2021 |  | 2020 |  | 2019
Balance at beginning of year | $ | 8,243 |  |  | $ | 5,474 |  |  | $ | 1,129 |
Charge to retained earnings - ASC 326 adoption impact | — |  |  | 2,026 |  |  | — |
(Credit) charge to income | (1,266) |  |  | 1,458 |  |  | 4,636 |
Deductions | (142) |  |  | (715) |  |  | (291) |
Balance at end of year | $ | 6,835 |  |  | $ | 8,243 |  |  | $ | 5,474 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 + Details
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