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股权投资（以权益法核算的投资）（详情）（美元）
除非另有说明，单位为千 |
Jun. 30, 2013
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Dec. 31, 2012
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Dec. 17, 2012
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| 权益法投资明细表[分项] | |||
| Equity investments | $ 438,864 | $ 381,484 | |
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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] | |||
| Equity investments | 203 | ||
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Tatex Thailand III， LLC[成员]
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| 权益法投资明细表[分项] | |||
| Equity investments | 9,138 | 8,657 | |
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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] | |||
| Equity investments | 176,876 | 172,766 | |
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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] | |||
| Equity investments | 13,816 | 13,518 | |
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Muskie Holdings LLC[成员]
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| 权益法投资明细表[分项] | |||
| Equity investments | 8,453 | 7,320 | |
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Timber Wolf Terminals LLC[成员]
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| 权益法投资明细表[分项] | |||
| Equity investments | 870 | 878 | |
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Windsor Midstream LLC[成员]
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| 权益法投资明细表[分项] | |||
| Equity investments | 9,664 | 9,503 | |
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Stingray Pressure Pumping LLC[成员]
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| 权益法投资明细表[分项] | |||
| Equity investments | 15,399 | 13,265 | |
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Stingray固井有限责任公司[成员]
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| 权益法投资明细表[分项] | |||
| Equity investments | 3,041 | 3,110 | |
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黑鹰中流有限责任公司[成员]
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| 权益法投资明细表[分项] | |||
| Equity investments | 0 | 0 | |
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黄貂鱼物流有限公司〔会员〕
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| 权益法投资明细表[分项] | |||
| Equity investments | 900 | 947 | |
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Diamondback Energy LLC[成员]
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| 权益法投资明细表[分项] | |||
| Equity investments | 198,662 | 151,317 | 138,500 |
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Stingray Energy Services LLC[成员]
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| 权益法投资明细表[分项] | |||
| Equity investments | $ 2,045 | $ 0 |