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股权投资（以权益法核算的投资）（详情）（美元）
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3月. 31, 2012
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12月. 31, 2011
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|---|---|---|
| 权益法投资明细表[分项] | ||
| 股权投资 | $ 163,174,000 | $ 86,824,000 |
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泰泰国际有限责任公司[成员]
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| 权益法投资明细表[分项] | ||
| 股权投资 | 829,000 | 1,030,000 |
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Tatex Thailand III， LLC[成员]
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| 权益法投资明细表[分项] | ||
| 股权投资 | 8,731,000 | 8,282,000 |
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灰熊油砂联盟[成员]
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| 权益法投资明细表[分项] | ||
| 股权投资 | 136,732,000 | 69,008,000 |
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Bison Drilling And Field Services LLC[成员]
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| 权益法投资明细表[分项] | ||
| 股权投资 | 6,361,000 | 6,366,000 |
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Muskie Holdings LLC[成员]
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| 权益法投资明细表[分项] | ||
| 股权投资 | 2,441,000 | 2,138,000 |
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Timber Wolf Terminals LLC[成员]
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| 权益法投资明细表[分项] | ||
| 股权投资 | 1,000,000 | |
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Windsor Midstream LLC[成员]
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| 权益法投资明细表[分项] | ||
| 股权投资 | $ 7,080,000 |