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Commitments And Contingencies (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2012
Supply Commitment [Line Items] |
Total rental commitments under non-cancelable leases | $ 12.3
Fracturing Services [Member] |
Supply Commitment [Line Items] |
Payments upon early contract termination | 66.6
Drilling Contracts [Member] |
Supply Commitment [Line Items] |
Payments upon early contract termination | 62.3
Long Term Commitments [Member] |
Supply Commitment [Line Items] |
Future obligations under supply agreements | $ 65.5
Long Term Commitments [Member] | Williston Basin Project [Member] |
Supply Commitment [Line Items] |
Minimum quantity of delivery | 17,600.0
Millions Of Barrels [Member] | Long Term Commitments [Member] | Williston Basin Project [Member] |
Supply Commitment [Line Items] |
Minimum quantity of delivery | 13.1

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