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Supplementary balance sheet detail (Tables) | 12 Months Ended
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Dec. 31, 2017
Balance Sheet Related Disclosures [Abstract] |
Schedule Of Amounts Recognized In Balance Sheet |
​ | ​ | ​ | ​ | ​ | ​
|  | As of December 31, 2017 |  | As of December 31, 2016 |
​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |
Inventories: |  |  |  |  |
Raw materials and supplies |  | $ | 39,434 |  | $ | 54,469 |
Work in process |  | 85,852 |  | 52,379 |
Finished goods |  | 48,865 |  | 49,263 |
​ | ​ | ​ | ​ | ​ | ​
|  | 174,151 |  | 156,111 |
​ | ​ | ​ | ​ | ​ | ​
Prepaid expenses and other current assets: |  |  |  |  |
Prepaid expenses |  | $ | 9,505 |  | $ | 6,096 |
Value added tax and other indirect taxes receivable |  | 18,627 |  | 12,984 |
Spare parts inventory |  | 11,010 |  | — |
Other current assets |  | 5,730 |  | 2,585 |
​ | ​ | ​ | ​ | ​ | ​
|  | $ | 44,872 |  | $ | 21,665 |
​ | ​ | ​ | ​ | ​ | ​
Property, plant and equipment: |  |  |  |  |
Land and improvements |  | $ | 46,599 |  | $ | 43,737 |
Buildings |  | 59,608 |  | 55,440 |
Machinery and equipment and other |  | 495,069 |  | 460,892 |
Construction in progress |  | 41,375 |  | 25,635 |
​ | ​ | ​ | ​ | ​ | ​
|  | $ | 642,651 |  | $ | 585,704 |
​ | ​ | ​ | ​ | ​ | ​
Other accrued liabilities: |  |  |  |  |
Payrolls (including incentive programs) |  | $ | 14,196 |  | $ | 4,802 |
Employee benefits |  | 4,684 |  | 11,439 |
Customer prepayments |  | 20,784 |  | — |
Other |  | 13,562 |  | 14,278 |
​ | ​ | ​ | ​ | ​ | ​
|  | $ | 53,226 |  | $ | 30,519 |
​ | ​ | ​ | ​ | ​ | ​
Other long term obligations: |  |  |  |  |
Postretirement benefits |  | $ | 20,508 |  | $ | 19,002 |
Pension and related benefits |  | 36,116 |  | 45,876 |
Other |  | 12,283 |  | 17,270 |
​ | ​ | ​ | ​ | ​ | ​
|  | $ | 68,907 |  | $ | 82,148 |
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Schedule Of Analysis Of The Allowance For Doubtful Accounts |
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|  | 2017 |  | 2016 |  | For the period August 15 through December 31, 2015 |  | For the period January 1 through August 14, 2015 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | (Dollars in thousands) |
Balance at beginning of year |  | $ | 326 |  | $ | 244 |  | $ | — |  | $ | 6,969 |
Additions |  | 771 |  | 129 |  | 244 |  | 85 |
Deductions |  | — |  | (47 | ) | — |  | (1,177 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at end of year |  | $ | 1,097 |  | $ | 326 |  | $ | 244 |  | $ | 5,877 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

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- Definition Tabular disclosure of the amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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