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Segment Reporting (Details 2) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Statoil ASA [Member] |  |  |
Revenues and percentage of consolidated revenues |  |  |
Revenue of Significant Customer | $ 283.7 | $ 330.4 | $ 346.6
Percentage of Revenue of Significant Customer | 15.00% | 16.00% | 16.00%
Petroleo Brasileiro SA [Member] |  |  |
Revenues and percentage of consolidated revenues |  |  |
Revenue of Significant Customer | 224.9 | 226.0 | 217.9
Percentage of Revenue of Significant Customer | 12.00% | 11.00% | 10.00%
BP PLC [Member] |  |  |
Revenues and percentage of consolidated revenues |  |  |
Revenue of Significant Customer | $ 190.3 | $ 222.2 | $ 152.0
Percentage of Revenue of Significant Customer |  | 11.00% |

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