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Supplementary Balance Sheet Detail | 12 Months Ended
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Dec. 31, 2018
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, 2018 |  | As of December 31, 2017
| (Dollars in thousands)
Inventories: |  |  |
Raw materials and supplies | $ | 99,935 |  |  | $ | 39,434 |
Work in process | 125,767 |  |  | 85,852 |
Finished goods | 68,015 |  |  | 48,865 |
| $ | 293,717 |  |  | $ | 174,151 |
Prepaid expenses and other current assets: |  |  |
Prepaid expenses | $ | 10,720 |  |  | $ | 9,505 |
Value added tax and other indirect taxes receivable | 19,242 |  |  | 18,627 |
Spare parts inventory | 11,507 |  |  | 11,010 |
Other current assets | 4,699 |  |  | 5,730 |
| $ | 46,168 |  |  | $ | 44,872 |
Property, plant and equipment: |  |  |
Land and improvements | $ | 45,947 |  |  | $ | 46,599 |
Buildings | 68,680 |  |  | 59,608 |
Machinery and equipment and other | 532,084 |  |  | 495,069 |
Construction in progress | 42,131 |  |  | 41,375 |
| $ | 688,842 |  |  | $ | 642,651 |
Other accrued liabilities: |  |  |
Payrolls (including incentive programs) | $ | 17,284 |  |  | $ | 14,196 |
Employee benefits | 6,977 |  |  | 4,684 |
Deferred Revenue | 5,380 |  |  | 20,784 |
Other | 20,811 |  |  | 13,562 |
| $ | 50,452 |  |  | $ | 53,226 |
Other long term obligations: |  |  |
Postretirement benefits | $ | 16,192 |  |  | $ | 20,508 |
Pension and related benefits | 33,718 |  |  | 36,116 |
Other | 22,609 |  |  | 12,283 |
| $ | 72,519 |  |  | $ | 68,907 |
The following table presents an analysis of the allowance for doubtful accounts:
| 2018 |  | 2017 |  | 2016
Balance at beginning of year | $ | 1,097 |  |  | $ | 326 |  |  | $ | 244 |
Additions | 122 |  |  | 771 |  |  | 129 |
Deductions | (90 | ) |  | — |  |  | (47 | )
Balance at end of year | $ | 1,129 |  |  | $ | 1,097 |  |  | $ | 326 |

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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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