Oil And Gas Properties (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Oil And Gas Properties [Line Items]
Net interest expense	$ 11,344	$ 11,645	$ 21,667	$ 26,122
Energy Resource Technology GOM, Inc [Member]
Oil And Gas Properties [Line Items]
Net interest expense		$ 6,800	$ 2,700	$ 14,000

Interest and debt related expenses associated with nonoperating financing activities of the entity.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration