Commitments and Contingencies (Rig Commitment) (Details 1) (USD $) In Millions, unless otherwise specified	Jun. 30, 2011
Commitments and Contingencies Disclosure [Abstract]
Rig Commitment Settlement Costs	$ 14

Settlement costs related to rig commitment dispute.

No definition available.

Name:	end_RigCommitmentSettlementCosts
Namespace Prefix:	end_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant