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Supplementary Balance Sheet Detail | 12 Months Ended
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Dec. 31, 2015
Balance Sheet Related Disclosures [Abstract] |
Supplementary Balance Sheet Detail | Supplementary Balance Sheet Detail The following tables present supplementary balance sheet details:
| At December 31,
2014 |  | 2015
| (Dollars in thousands)
Inventories: |  |  |
Raw materials and supplies | $ | 122,218 |  |  | $ | 80,408 |
Work in process | 176,141 |  |  | 136,858 |
Finished goods | 84,544 |  |  | 78,196 |
| 382,903 |  |  | 295,462 |
Prepaid expenses and other current assets: |  |  |
Prepaid expenses | $ | 9,923 |  |  | $ | 9,297 |
Current portion of deferred taxes | 28,426 |  |  | — |
Value added tax and other indirect taxes receivable | 39,837 |  |  | 10,087 |
Other current assets | 3,437 |  |  | 2,290 |
| $ | 81,623 |  |  | $ | 21,674 |
Property, plant and equipment: |  |  |
Land and improvements | $ | 36,375 |  |  | $ | 54,064 |
Buildings | 193,427 |  |  | 76,331 |
Machinery and equipment and other | 1,212,120 |  |  | 486,194 |
Construction in progress | 58,899 |  |  | 44,291 |
| $ | 1,500,821 |  |  | $ | 660,880 |
Other accrued liabilities: |  |  |
Payrolls (including incentive programs) | $ | 6,151 |  |  | $ | 4,588 |
Customer prepayments | 5,534 |  |  | 559 |
Employee compensation and benefits | 8,932 |  |  | 7,842 |
Other | 22,702 |  |  | 16,790 |
| $ | 43,319 |  |  | $ | 29,779 |
Other long term obligations: |  |  |
Postretirement benefits | $ | 24,833 |  |  | $ | 20,019 |
Pension and related benefits | 65,882 |  |  | 55,364 |
Other | 16,851 |  |  | 20,102 |
| $ | 107,566 |  |  | $ | 95,485 |
The following table presents an analysis of the allowance for doubtful accounts:
| As of December 31, |  | For the Period January 1 through August 14, 2015 |  | For the Period August 15 through December 31, 2015
2013 |  | 2014 |  |
| (Dollars in thousands)
Balance at beginning of year | $ | 7,573 |  |  | $ | 6,718 |  |  | $ | 7,471 |  |  | $ | — |
Additions | 2,914 |  |  | 8,675 |  |  | 1,156 |  |  | 304 |
Deductions | (3,769 | ) |  | (7,922 | ) |  | (2,313 | ) |  | — |
Balance at end of year | $ | 6,718 |  |  | $ | 7,471 |  |  | $ | 6,314 |  |  | $ | 304 |

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