Commitments and Contingencies (Details 2) (Action brought by Clovelly Oil Company in the 13th Judicial District Court in Louisiana)	1 Months Ended	12 Months Ended
	May 31, 2009 acre	Dec. 31, 2007
Action brought by Clovelly Oil Company in the 13th Judicial District Court in Louisiana
Litigation
Working interest in certain acreage (as a percent)		43.75%
Interest alleged by the plaintiff to be entitled to (as a percent)	56.25%
Area of the entity's Crowell Land & Mineral lease (in acres)	242.28