Disclosure About Oil and Gas Producing Activities (Unaudited) (Details 1)	Dec. 31, 2013 bbl	Dec. 31, 2012 bbl	Dec. 31, 2011 bbl	Dec. 31, 2010 bbl
Oil Reserves [Member]
Reserve Quantities [Line Items]
Developed	20,566,000	10,531,000	11,794,000	11,013,000
Undeveloped	13,553,000	7,606,000	21,287,000	20,671,000
Total Proved	34,119,000	18,137,000	33,081,000	31,684,000
Natural Gas Reserves [Member]
Reserve Quantities [Line Items]
Developed	1,777,267,000	1,820,994,000	1,973,391,000	1,678,697,000
Undeveloped	1,632,475,000	1,145,451,000	2,805,163,000	2,521,458,000
Total Proved	3,409,742,000	2,966,445,000	4,778,554,000	4,200,155,000