| Dec 31, 2011 | Dec 31, 2012 | Dec 31, 2013 | Dec 31, 2014 | Dec 31, 2015 | Dec 31, 2016 | Dec 31, 2017 | Dec 31, 2018 | Dec 31, 2019 | Dec 31, 2020 | Dec 31, 2021 | Dec 31, 2022 | Dec 31, 2023 | Dec 31, 2024 |
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| Net income | 40 | 25 | 20 | 42 | 32 | 26 | 11 | 21 | 51 | 15 | 72 | 86 | 96 | 6 |
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| Depreciation, Depletion and Amortization | 44 | 37 | 42 | 43 | - | - | - | 36 | 41 | 42 | 44 | 53 | 62 | 69 |
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| Amortization of Debt Issuance Costs | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 |
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| Stock-based compensation expense (non-cash) | 5 | 6 | 6 | 5 | 5 | 3 | 5 | 5 | 7 | 6 | 7 | 9 | 10 | 11 |
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| Amortization Of Retirement Benefit Adjustments | - | - | - | - | - | - | - | - | - | - | - | -0 | -1 | -0 |
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| Loss on sale of property, plant, and equipment | - | - | - | - | - | 1 | 1 | -1 | -0 | -0 | 0 | -0 | -0 | -1 |
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| Deferred income tax (benefit) expense | -2 | -2 | -2 | -5 | 4 | -9 | 20 | -1 | 3 | -10 | -13 | 2 | -7 | -17 |
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| Impairment charges | - | - | - | - | - | - | - | - | 14 | 10 | - | - | - | 73 |
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| Loss on asset disposal | - | - | - | - | - | - | - | - | - | - | - | - | - | -6 |
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| Net pension curtailments and settlements | - | - | - | - | - | - | - | - | -3 | -0 | - | 1 | -0 | - |
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| Decrease (increase) in accounts receivable | -27 | 9 | -12 | 2 | -15 | 4 | 18 | 7 | 24 | 1 | 30 | 4 | -23 | 4 |
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| Decrease (increase) in inventory | 30 | 19 | 8 | 30 | -19 | -11 | 9 | -4 | -24 | 1 | 43 | 64 | 19 | 0 |
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| Decrease (increase) in prepaid and other current assets | 8 | -0 | -7 | 0 | -2 | -1 | 12 | -1 | -1 | -2 | 4 | 2 | 23 | 11 |
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| Increase (decrease) in accounts payable and accrued expenses | - | - | - | - | - | - | - | - | - | - | 40 | 13 | 7 | -16 |
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| Increase (decrease) in unearned revenue | 1 | -1 | -1 | 4 | -1 | -3 | 4 | 0 | -3 | 3 | 0 | 0 | -17 | -25 |
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| Increase Decrease In Interest And Taxes Payable | -6 | -2 | 2 | 1 | -1 | 3 | -1 | 0 | -1 | -0 | -0 | 0 | 4 | -3 |
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| Increase (Decrease) in Other Deferred Liability | - | - | - | - | - | - | - | - | - | 54 | 14 | 22 | 17 | - |
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| Other — net | 5 | 3 | -0 | 3 | 2 | -8 | -6 | 2 | 3 | 0 | 3 | -0 | -8 | -4 |
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| Net cash provided by operating activities | 57 | 39 | 76 | 60 | 90 | 67 | 68 | 76 | 99 | 101 | 90 | 116 | 144 | 88 |
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| Payments for acquisition, net of cash acquired | 22 | 4 | - | - | - | 2 | 17 | - | - | 131 | 392 | 3 | - | - |
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| Payments for purchase of property, plant, and equipment | 28 | 34 | 28 | 29 | 30 | 27 | 28 | 28 | 24 | 67 | 103 | 78 | 111 | 69 |
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| Payments for mine development | - | - | - | - | - | - | - | - | - | - | - | - | 9 | 12 |
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| Proceeds from sale of property, plant, and equipment | 0 | - | 0 | 3 | 0 | 1 | 2 | 0 | 0 | 0 | 1 | 1 | 1 | 1 |
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| Net cash used in investing activities | -50 | -43 | -33 | -27 | -52 | -37 | -43 | -34 | -26 | -195 | -494 | -80 | -119 | -80 |
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| Proceeds from Long-Term Lines of Credit | - | - | - | - | - | - | - | - | - | - | 118 | -9 | 8 | 46 |
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| Repayment of debt | - | - | - | - | - | - | - | - | - | - | - | 19 | 15 | 30 |
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| Principal payments under finance lease obligations | - | - | - | - | - | - | - | - | - | - | 3 | 3 | 2 | 1 |
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| Cash dividends paid | - | 5 | 6 | 7 | 7 | 7 | 8 | 8 | 9 | 9 | 10 | 10 | 11 | 11 |
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| Deferred financing costs | 3 | - | 2 | - | 1 | 1 | 0 | - | 2 | - | 7 | - | - | 0 |
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| Payments for withholding taxes for stock-based compensation awards | - | - | - | - | - | - | 5 | 3 | 5 | 2 | 3 | 4 | 5 | 8 |
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| Net cash used in financing activities | -11 | 9 | -36 | -41 | -26 | -22 | -15 | -14 | -18 | -7 | 393 | -36 | -25 | -4 |
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| Effects of exchange rate changes | - | - | - | - | - | - | - | - | - | - | - | -2 | -0 | -1 |
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| Net change in cash and cash equivalents | - | - | - | - | - | - | - | - | - | -99 | -11 | -1 | 0 | 3 |
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