Disclosure About Oil and Gas Producing Activities (Unaudited) (Details)	12 Months Ended
	Dec. 31, 2014 bbl	Dec. 31, 2013 bbl	Dec. 31, 2012 bbl
Oil Reserves [Member]
Increase (Decrease) in Proved Developed and Undeveloped Reserves [Roll Forward]
Reserves, Beginning Balance	34,119,000	18,137,000	33,081,000
Extensions, discoveries and additions	34,275,000	11,329,000	5,435,000
Sales	0	0	0
Acquisitions	9,381,000	10,114,000	0
Production	(3,409,000)	(1,196,000)	(1,282,000)
Revisions	(6,600,000)	(4,265,000)	(19,097,000)
Reserves, Ending Balance	67,766,000	34,119,000	18,137,000
Natural Gas Reserves [Member]
Increase (Decrease) in Proved Developed and Undeveloped Reserves [Roll Forward]
Reserves, Beginning Balance	3,409,742,000	2,966,445,000	4,778,554,000
Extensions, discoveries and additions	866,513,000	1,409,528,000	819,896,000
Sales	(239,290,000)	0	0
Acquisitions	1,345,964,000	0	0
Production	(228,517,000)	(224,912,000)	(249,310,000)
Revisions	(323,218,000)	(741,319,000)	(2,382,695,000)
Reserves, Ending Balance	4,831,194,000	3,409,742,000	2,966,445,000
Natural Gas Liquids Reserves [Member]
Increase (Decrease) in Proved Developed and Undeveloped Reserves [Roll Forward]
Reserves, Beginning Balance	0	0	0
Extensions, discoveries and additions	210,000	0	0
Sales	0	0	0
Acquisitions	21,740,000	0	0
Production	0	0	0
Revisions	43,000	0	0
Reserves, Ending Balance	21,993,000	0	0