Supplementary Oil and Natural Gas Disclosures (Unaudited) (Narrative) (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Supplementary Oil and Natural Gas Disclosures (Unaudited) [Abstract]
Significant Changes in Reserves	Includes extensions and discoveries across 12 different fields, primarily within our Ship Shoal and West Delta areas. The Ship Shoal 208 field accounts for 46% of our total extensions and discoveries with 4,973 Mboe, consisting of 3,967 Mbbls of oil and 6,035 Mmcf of produced gas. The remaining 11 locations account for up to 16% each of total extensions and discoveries with reserves ranging from 10 Mboe to 1.6 Mmboe.	Includes extensions and discoveries across 6 different fields, primarily within our West Delta and Ship Shoal areas. These extensions and discoveries added volumes ranging from 18 Mboe to 1.2 Mmboe each, with three exceeding 1.0 Mmboe each.