| Sep 30, 2011 | Sep 30, 2012 | Sep 30, 2013 | Sep 30, 2014 | Sep 30, 2015 | Sep 30, 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 | - | - | - | - | 8 | - | 61 | - | - | 12 | 40 | 4 | 5 | 6 |
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| Depreciation, depletion and amortization | 12 | 13 | 14 | 16 | 8 | 8 | 15 | 8 | 6 | 6 | 13 | 11 | 11 | 10 |
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| Deferred income taxes | 0 | 2 | 4 | -1 | 2 | 2 | 10 | 2 | 22 | 6 | 8 | 2 | 1 | -2 |
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| Equity in loss of joint ventures | -0 | -0 | -0 | -0 | -0 | -1 | -2 | -0 | -2 | -6 | -6 | -6 | -12 | -11 |
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| Gain on sale of equipment and property | -0 | -2 | -9 | 1 | -0 | 6 | -0 | 0 | 1 | 9 | 1 | 1 | 0 | 0 |
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| Stock-based compensation | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 0 | 1 | 1 | 2 | 2 | 2 |
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| Accounts receivable | 1 | 0 | -0 | -1 | -0 | 0 | 0 | -0 | -0 | 0 | -1 | 0 | -0 | 0 |
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| Deferred costs and other assets | 0 | 1 | -1 | 0 | 1 | 2 | 1 | 0 | 1 | -0 | 0 | 2 | 0 | -1 |
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| Accounts payable and accrued liabilities | 1 | 2 | 1 | -0 | -2 | 3 | -0 | 1 | -0 | 1 | 2 | -0 | 3 | -1 |
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| Income taxes payable and receivable | 1 | -0 | 1 | 0 | -1 | 0 | -4 | -7 | 10 | -5 | 4 | 1 | -0 | 1 |
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| Other long-term liabilities | - | - | - | - | 0 | 0 | -0 | -2 | 2 | 1 | 1 | 0 | -0 | -0 |
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| Net cash provided by operating activities | 21 | 20 | 27 | 23 | 17 | 19 | 21 | -37 | 47 | 19 | 22 | 22 | 33 | 29 |
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| Investments in properties | 7 | 10 | 16 | 10 | 6 | 28 | 17 | 7 | 10 | 18 | 17 | 28 | 11 | 51 |
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| Investments in joint ventures | 0 | 0 | 0 | 5 | 1 | 1 | 1 | 71 | 74 | 12 | 13 | 22 | 47 | 16 |
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| Return of capital from investments in joint ventures | - | - | - | - | - | - | - | - | - | - | 22 | 21 | 9 | 17 |
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| Proceeds from sales of investments available for sale | - | - | - | - | - | - | - | 280 | 116 | 86 | 70 | 4 | - | - |
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| Cash held in escrow | - | - | - | - | - | - | - | - | - | - | - | - | - | 0 |
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| Proceeds from sale of assets | 1 | 3 | 18 | 3 | 0 | 13 | - | - | 8 | 19 | 1 | 1 | 0 | 0 |
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| Net cash (used in) provided by investing activities | -12 | - | - | - | -10 | -15 | -17 | 91 | -34 | 51 | 67 | -23 | -49 | -51 |
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| Proceeds from Noncontrolling Interests | - | - | - | - | - | - | - | - | - | - | - | - | - | 16 |
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| Distribution to noncontrolling interests | - | - | - | - | - | - | - | - | - | - | - | - | - | 3 |
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| Repurchase of Company stock | 1 | 0 | 0 | - | - | 0 | 0 | 6 | 8 | 21 | 0 | - | 2 | - |
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| Exercise of employee stock options | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 1 | 0 | 0 | 0 | 0 | 1 | 0 |
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| Net cash (used in) provided by financing activities | -5 | -3 | -11 | 17 | -8 | -5 | 1 | -36 | -9 | -22 | -1 | 17 | -4 | 13 |
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| Net (decrease) increase in cash and cash equivalents | - | - | - | - | - | - | - | - | - | - | - | - | - | -9 |
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| Interest | 3 | 3 | 3 | 1 | 2 | 2 | 5 | 3 | 1 | 1 | 2 | 3 | 4 | 3 |
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| Income taxes | - | - | - | - | - | - | - | - | -26 | 2 | -1 | -2 | 1 | 3 |
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