| Dec 31, 2011 | Dec 31, 2013 | Dec 31, 2019 | Dec 31, 2020 | Dec 31, 2021 | Dec 31, 2022 | Dec 31, 2023 | Dec 31, 2024 |
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| Cash and cash equivalents | 7 | - | 50 | 84 | 82 | 126 | 223 | 326 |
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| Accounts Receivable, after Allowance for Credit Loss, Current | 461 | - | 243 | 162 | 259 | 417 | 325 | 277 |
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| Inventories | 100 | - | 101 | 83 | 79 | 97 | 111 | 108 |
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| Income taxes receivable | 11 | - | 24 | 83 | 59 | 42 | 52 | 4 |
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| Prepaid expenses | 8 | - | 10 | 9 | 10 | 18 | 13 | 16 |
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| Other current assets | 31 | - | 3 | 3 | 3 | 3 | 3 | 2 |
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| Total current assets | 627 | - | 437 | 428 | 492 | 703 | 727 | 733 |
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| Property, Plant and Equipment, Net | 675 | - | 517 | 264 | 254 | 333 | 435 | 514 |
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| Operating lease right-of-use assets | - | - | 34 | 27 | 25 | 29 | 25 | 27 |
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| Finance lease right-of-use assets | - | - | - | - | 20 | - | 1 | 4 |
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| Goodwill | 24 | - | 32 | 32 | 32 | 32 | 51 | 51 |
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| Other intangibles, net | - | - | - | - | - | - | 13 | 14 |
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| Retirement plan assets | - | - | - | - | - | - | - | 31 |
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| Other assets | 12 | - | 34 | 38 | 41 | 32 | 35 | 13 |
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| Total assets | 1,338 | - | 1,053 | 791 | 864 | 1,129 | 1,287 | 1,386 |
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| Accounts payable | 123 | - | 53 | 41 | 74 | 115 | 85 | 84 |
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| Accrued Salaries, Current | - | - | - | - | - | 33 | 31 | 25 |
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| Accrued insurance expenses | 6 | - | 8 | 5 | 10 | 3 | 5 | 8 |
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| Accrued state, local and other taxes | 5 | - | 2 | 3 | 2 | 4 | 4 | 3 |
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| Income taxes payable | 11 | - | 2 | 1 | 1 | 0 | 0 | 0 |
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| Unearned revenue | - | - | - | - | - | - | 16 | 45 |
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| Operating Lease, Liability, Current | - | - | 11 | 9 | 6 | 11 | 7 | 7 |
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| Finance Lease And Finance Obligations, Liability, Current | - | - | - | - | - | - | 0 | 4 |
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| Other Accrued Liabilities, Current | 1 | - | 6 | 1 | 2 | 2 | 2 | 5 |
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| Total current liabilities | 179 | - | 101 | 80 | 131 | 179 | 152 | 182 |
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| Accrued Insurance, Noncurrent | 9 | - | 14 | 12 | 12 | 7 | 10 | 12 |
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| Retirement plan liabilities | 24 | - | 39 | 33 | 35 | 23 | 24 | 25 |
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| Deferred income taxes | - | - | 37 | 13 | 18 | 37 | 51 | 58 |
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| Long-term operating lease liabilities | - | - | 28 | 21 | 20 | 20 | 19 | 22 |
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| Long-term finance lease liabilities | - | - | - | - | - | - | 1 | 1 |
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| Other long-term liabilities | 3 | - | 2 | 0 | 7 | 5 | 8 | 9 |
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| Total liabilities | 576 | - | 223 | 159 | 223 | 271 | 264 | 308 |
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| Common Stock, Value, Issued | 15 | - | 21 | 21 | 22 | 22 | 22 | 21 |
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| Retained earnings | 760 | - | 832 | 628 | 641 | 856 | 1,003 | 1,060 |
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| Accumulated other comprehensive loss | -13 | - | -23 | -18 | -21 | -20 | -2 | -3 |
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| Total stockholders' equity | 763 | - | 830 | 632 | 642 | 858 | 1,023 | 1,078 |
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| Total liabilities and stockholders' equity | 1,338 | - | 1,053 | 791 | 864 | 1,129 | 1,287 | 1,386 |
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