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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 |
3月. 31, 2013
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12月. 31, 2012
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12月. 17, 2012
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| 权益法投资明细表[分项] | |||
| 股权投资 | $ 451,592 | $ 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] | |||
| 股权投资 | 15 | 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] | |||
| 股权投资 | 8,639 | 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] | |||
| 股权投资 | 176,196 | 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] | |||
| 股权投资 | 13,988 | 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] | |||
| 股权投资 | 7,702 | 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] | |||
| 股权投资 | 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] | |||
| 股权投资 | 9,887 | 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] | |||
| 股权投资 | 15,718 | 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] | |||
| 股权投资 | 3,088 | 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] | |||
| 股权投资 | 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] | |||
| 股权投资 | 928 | 947 | |
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Diamondback Energy LLC[成员]
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| 权益法投资明细表[分项] | |||
| 股权投资 | 212,413 | 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] | |||
| 股权投资 | $ 2,148 | $ 0 |