Oil and Gas Disclosures (Unaudited) - Estimates of Proved Crude Oil and Natural Gas Reserves (Details)	12 Months Ended
	Dec. 31, 2013 MBbls		Dec. 31, 2012 MBbls
Oil (Mbbl)
Beginning balance	17		0
Extensions and discoveries	187
Revisions	4
Production	(11)		(4)
Purchases of reserves in place			21
Ending balance	197		17
December 31, 2013	52	[1]
December 31, 2013	145	[1]
Gas (MMcf)
Beginning balance	29		0
Extensions and discoveries	247
Revisions	(2)
Production	(14)		(6)
Purchases of reserves in place			35
Ending balance	260		29
December 31, 2013	73	[1]
December 31, 2013	187	[1]

[1] All reserves were held within the United States for the years ended December 31, 2013 and 2012.