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

The minimum amount the entity agreed to spend under the long-term purchase commitment.

No definition available.

Name:	us-gaap_LongTermPurchaseCommitmentAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration