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Commitments and Contingencies Narrative (Details) (Drilling Rig Leasing Contracts [Member], USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014
Drilling Rig Leasing Contracts [Member] |
Long-term Purchase Commitment [Line Items] |
Long-term Purchase Commitment, Amount | $ 52.7

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- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment. + References No definition available. + Details
Name: | us-gaap_LongTermPurchaseCommitmentAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_LongTermPurchaseCommitmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration