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Supplementary Balance Sheet Detail | 12 Months Ended
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Dec. 31, 2014
Balance Sheet Related Disclosures [Abstract] |
Supplementary Balance Sheet Detail | Supplementary Balance Sheet Detail The following tables present supplementary balance sheet details:
| At December 31,
2013 |  | 2014
| (Dollars in thousands)
Inventories: |  |  |
Raw materials and supplies | $ | 175,192 |  |  | $ | 122,218 |
Work in process | 239,114 |  |  | 176,141 |
Finished goods | 76,108 |  |  | 84,544 |
| 490,414 |  |  | 382,903 |
Prepaid expenses and other current assets: |  |  |
Prepaid expenses | $ | 9,554 |  |  | $ | 9,923 |
Current portion of deferred taxes | 37,058 |  |  | 28,426 |
Value added tax and other indirect taxes receivable | 25,061 |  |  | 39,837 |
Other current assets | 2,117 |  |  | 3,437 |
| $ | 73,790 |  |  | $ | 81,623 |
Property, plant and equipment: |  |  |
Land and improvements | $ | 37,416 |  |  | $ | 36,375 |
Buildings | 196,802 |  |  | 193,427 |
Machinery and equipment and other | 1,278,655 |  |  | 1,212,120 |
Construction in progress | 76,007 |  |  | 58,899 |
| $ | 1,588,880 |  |  | $ | 1,500,821 |
Other accrued liabilities: |  |  |
Payrolls (including incentive programs) | $ | 9,330 |  |  | $ | 6,151 |
Customer prepayments | 9,599 |  |  | 5,534 |
Employee compensation and benefits | 10,136 |  |  | 8,932 |
Other | 11,874 |  |  | 22,702 |
| $ | 40,939 |  |  | $ | 43,319 |
Other long term obligations: |  |  |
Postretirement benefits | $ | 24,852 |  |  | $ | 24,833 |
Pension and related benefits | 54,173 |  |  | 65,882 |
Other | 18,922 |  |  | 16,851 |
| $ | 97,947 |  |  | $ | 107,566 |
The following table presents an analysis of the allowance for doubtful accounts:
| At December 31,
2012 |  | 2013 |  | 2014
| (Dollars in thousands)
Balance at beginning of year | $ | 4,153 |  |  | $ | 7,573 |  |  | $ | 6,718 |
Additions | 5,161 |  |  | 2,914 |  |  | 8,675 |
Deductions | (1,741 | ) |  | (3,769 | ) |  | (7,922 | )
Balance at end of year | $ | 7,573 |  |  | $ | 6,718 |  |  | $ | 7,471 |
Inventories We allocate fixed production overheads to the costs of conversion based on normal capacity of the production facilities. We recognize abnormal amounts of idle facility expense, freight, handling costs, and wasted materials (spoilage) as current period charges. During 2012, costs in excess of normal absorption were $3.5 million. During 2013 and 2014, there were no costs in excess of normal absorption.

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