| Dec 31, 2010 | 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 (loss) income | - | 109 | 87 | 22 | 10 | -525 | -67 | -23 | 12 | 14 | -27 | 250 | 72 | -36 | -213 |
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| Depreciation, depletion, and amortization | - | - | - | - | - | - | - | - | - | 34 | 36 | 36 | 35 | 39 | 37 |
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| Amortization of intangible assets | - | - | - | - | - | - | - | - | - | 0 | 0 | 0 | 0 | 0 | 0 |
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| Accretion of asset retirement obligation | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
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| Amortization of Debt Issuance Costs | - | - | - | - | - | - | 2 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 |
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| Stock-based compensation | - | 5 | 5 | 5 | 4 | 5 | 4 | 4 | 4 | 4 | 4 | 3 | 6 | 7 | 4 |
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| Reserve for obsolescence | - | - | - | - | - | - | 0 | 1 | 0 | - | 0 | 2 | 2 | 1 | 2 |
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| Allowance for doubtful accounts | - | - | - | - | - | - | - | 1 | 0 | 0 | 0 | - | - | 0 | 0 |
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| Impairment of long-lived assets | - | - | - | - | - | 324 | - | - | - | - | - | - | - | 43 | 11 |
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| Loss on disposal of assets | - | - | - | - | - | -1 | -0 | -2 | 0 | -0 | 4 | 3 | -7 | -1 | -2 |
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| Unrealized Gain (Loss) on Investments | - | - | - | - | - | - | - | - | - | - | - | - | - | - | -0 |
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| Equity in earnings of unconsolidated entities | - | - | - | - | - | - | - | - | - | - | - | - | 1 | -0 | -0 |
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| Proceeds from Equity Method Investment, Distribution | - | - | - | - | - | - | - | - | - | - | - | - | - | 0 | - |
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| Inventory Write-down | - | - | - | 4 | 8 | 32 | 20 | 7 | 2 | 2 | 4 | - | - | 6 | 4 |
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| Trade accounts receivable, net | - | 6 | 2 | -11 | 8 | -19 | 1 | 6 | 7 | -1 | -1 | 13 | -9 | -5 | 1 |
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| Other receivables, net | - | 6 | 2 | -2 | -4 | -2 | -1 | 0 | -0 | 1 | 1 | -1 | -0 | 1 | -1 |
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| Inventory, net | - | 10 | -1 | 58 | -9 | 55 | 12 | 7 | 0 | 12 | 0 | -7 | 33 | 12 | 11 |
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| Other current assets | - | -1 | 0 | 0 | -1 | 13 | -5 | -3 | -2 | 1 | -2 | 2 | -0 | 4 | 0 |
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| Deferred tax assets, net | - | 49 | 38 | 30 | 2 | 150 | - | - | - | - | - | -209 | 23 | -8 | 194 |
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| Increase (Decrease) in Accounts Payable and Accrued Liabilities | - | 5 | 7 | -3 | 2 | -6 | -12 | -4 | 2 | 2 | 2 | 13 | -4 | 1 | -4 |
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| Operating lease liabilities | - | - | - | - | - | - | - | - | - | -2 | -2 | -3 | -2 | -2 | -1 |
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| Deferred other income | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 43 |
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| Other liabilities | - | -2 | 2 | -1 | -1 | -0 | -1 | 0 | 12 | 5 | 13 | 3 | -29 | -1 | 1 |
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| Net cash provided by operating activities | - | - | - | - | - | - | - | - | 64 | 49 | 31 | 79 | 89 | 43 | 72 |
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| Additions to property, plant, equipment, mineral properties and other assets | - | 136 | 193 | 205 | 62 | 46 | 18 | 14 | 17 | 64 | 16 | 20 | 69 | 65 | 39 |
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| Additions to intangible Assets | - | - | - | - | - | - | - | - | - | 17 | - | - | - | - | 0 |
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| Proceeds from Sale of Property, Plant, and Equipment | - | - | - | 6 | 0 | - | - | 6 | 0 | 0 | 5 | 6 | 0 | 0 | 5 |
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| Purchase of investments | - | - | - | - | - | - | - | - | - | - | 4 | 1 | 13 | 1 | - |
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| Proceeds from redemptions/maturities of investments | - | - | - | - | - | - | - | - | - | - | - | - | 3 | 6 | 3 |
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| Other investing, net | - | - | -0 | - | - | - | - | - | - | - | - | - | - | -1 | -2 |
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| Net cash used in investing activities | - | - | - | - | - | - | - | - | -17 | -81 | -15 | -15 | -79 | -60 | -30 |
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| Repayments of long-term debt | - | - | - | - | - | - | 15 | 75 | 10 | - | 35 | 15 | - | - | - |
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| Debt prepayment costs | - | - | - | - | - | - | - | - | - | - | 2 | 1 | - | - | - |
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| Proceeds from loan under CARES Act | - | - | - | 150 | - | - | - | - | - | - | - | - | - | - | - |
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| Proceeds from Lines of Credit | - | - | - | - | - | - | - | 22 | 14 | 30 | 10 | - | - | 9 | - |
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| Repayments of borrowings on credit facility | - | - | - | - | - | - | - | 18 | 17 | 11 | - | 30 | - | 5 | 4 |
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| Payments of financing leases | - | - | - | - | - | - | - | - | - | - | 0 | 1 | - | 1 | 1 |
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| Capitalized debt costs | - | 1 | 0 | 1 | - | 0 | 4 | 0 | 0 | 1 | 0 | - | 1 | - | - |
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| Employee tax withholding paid for restricted stock upon vesting | - | - | - | - | - | 1 | 0 | 1 | 1 | 1 | 0 | 1 | 5 | 2 | 1 |
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| Repurchases of common stock | - | - | - | - | - | - | - | - | - | - | - | - | 22 | - | - |
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| Proceeds from Stock Options Exercised | - | 0 | 0 | - | - | - | - | 0 | 0 | 0 | 0 | 0 | 0 | - | - |
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| Net cash (used in) provided by financing activities | - | - | - | - | - | - | - | - | -15 | 19 | -17 | -47 | -28 | 2 | -6 |
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| Net Change in Cash, Cash Equivalents, and Restricted Cash | - | - | - | - | - | - | - | - | 32 | -12 | -1 | 17 | -18 | -14 | 37 |
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| Interest | - | - | - | - | - | - | - | 12 | 3 | 3 | 2 | 1 | 0 | 0 | 1 |
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| Income taxes | - | 14 | 8 | 0 | -17 | 0 | -0 | -1 | -3 | 1 | 0 | 0 | 1 | 0 | 0 |
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| Capital Expenditures Incurred but Not yet Paid | - | 17 | 24 | 30 | 5 | 4 | 1 | 4 | 1 | 5 | 0 | 2 | 9 | 5 | 2 |
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