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Supplemental Gas Data Oil and Gas Reserve Quantities (Details) (USD $)
12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
MMcf
Dec. 31, 2012
MMcf
Dec. 31, 2011
MMcf
Dec. 31, 2010
MMcf
Dec. 31, 2013
proved undeveloped [Member]
MMcf
Dec. 31, 2012
proved undeveloped [Member]
MMcf
Jan. 02, 2012
proved undeveloped [Member]
MMcf
Dec. 31, 2011
proved undeveloped [Member]
MMcf
Dec. 31, 2013
Price Changes [Member]
MMcf
Dec. 31, 2013
Plan and Other Revisions [Member]
MMcf
Dec. 31, 2013
Proved Developed [Member]
MMcf
Dec. 31, 2012
Proved Developed [Member]
MMcf
Dec. 31, 2011
Proved Developed [Member]
MMcf
Dec. 31, 2013
Natural Gas [Member]
MMcf
Dec. 31, 2012
Natural Gas [Member]
MMcf
Dec. 31, 2011
Natural Gas [Member]
MMcf
Dec. 31, 2010
Natural Gas [Member]
MMcf
Dec. 31, 2013
Natural Gas [Member]
proved undeveloped [Member]
MMcf
Dec. 31, 2012
Natural Gas [Member]
proved undeveloped [Member]
MMcf
Dec. 31, 2011
Natural Gas [Member]
proved undeveloped [Member]
MMcf
Dec. 31, 2011
Natural Gas [Member]
Plan and Other Revisions [Member]
MMcf
Dec. 31, 2013
Natural Gas [Member]
Proved Developed [Member]
MMcf
Dec. 31, 2012
Natural Gas [Member]
Proved Developed [Member]
MMcf
Dec. 31, 2011
Natural Gas [Member]
Proved Developed [Member]
MMcf
Dec. 31, 2013
Natural Gas Liquids [Member]
MMcf
Dec. 31, 2012
Natural Gas Liquids [Member]
MMcf
Dec. 31, 2011
Natural Gas Liquids [Member]
MMcf
Dec. 31, 2010
Natural Gas Liquids [Member]
MMcf
Dec. 31, 2013
Natural Gas Liquids [Member]
proved undeveloped [Member]
MMcf
Dec. 31, 2012
Natural Gas Liquids [Member]
proved undeveloped [Member]
MMcf
Dec. 31, 2011
Natural Gas Liquids [Member]
proved undeveloped [Member]
MMcf
Dec. 31, 2011
Natural Gas Liquids [Member]
Plan and Other Revisions [Member]
MMcf
Dec. 31, 2013
Natural Gas Liquids [Member]
Proved Developed [Member]
MMcf
Dec. 31, 2012
Natural Gas Liquids [Member]
Proved Developed [Member]
MMcf
Dec. 31, 2011
Natural Gas Liquids [Member]
Proved Developed [Member]
MMcf
Dec. 31, 2013
Crude Oil and NGL [Member]
MMcf
Dec. 31, 2012
Crude Oil and NGL [Member]
MMcf
Dec. 31, 2011
Crude Oil and NGL [Member]
MMcf
Dec. 31, 2010
Crude Oil and NGL [Member]
MMcf
Dec. 31, 2013
Crude Oil and NGL [Member]
proved undeveloped [Member]
MMcf
Dec. 31, 2012
Crude Oil and NGL [Member]
proved undeveloped [Member]
MMcf
Dec. 31, 2011
Crude Oil and NGL [Member]
proved undeveloped [Member]
MMcf
Dec. 31, 2011
Crude Oil and NGL [Member]
Plan and Other Revisions [Member]
MMcf
Dec. 31, 2013
Crude Oil and NGL [Member]
Proved Developed [Member]
MMcf
Dec. 31, 2012
Crude Oil and NGL [Member]
Proved Developed [Member]
MMcf
Dec. 31, 2011
Crude Oil and NGL [Member]
Proved Developed [Member]
MMcf
Reserve Quantities [Line Items]                                                                                            
Payments to Acquire Property, Plant, and Equipment $ 1,496,056,000 $ 1,245,497,000 $ 1,178,375,000   $ 202,066                                                                                  
Proved undeveloped reserves (Volume)         3,216,920,000   1,827,975,000                                                                              
undeveloped reserves transferred to developed         (230,333,000)                                                                                  
Beginning reserves 5,731,214,000 3,993,458,000 3,480,027,000 3,731,597,000 3,216,920,000 1,827,975,000   1,344,222,000     2,514,294,000 2,165,483,000 2,135,805,000   3,905,437,000 3,470,551,000 3,724,361,000 3,114,695,000 1,755,525,000 1,344,222,000   2,470,412,000 2,149,912,000 2,126,330,000 21,547,000 13,375,000 25,000 0 15,607,000 12,075,000 0   5,939,000 1,717,000 0 2,807,000 1,297,000 1,555,000 1,206,000 1,431,000 0 0   1,375,000 878,000 1,579,000
Price Changes 171,953,000 241,989,000 (73,837,000)                     176,045,000 243,442,000 (76,486,000)                 (1,017,000) 469,000 25,000                 336,000 (710,000) 416,000                
Proved Developed and Undeveloped Reserves, Improved Recovery 104,757,000 (526,611,000) (9,976,000)                     104,728,000 (526,608,000) (9,976,000)                 4,000 0 0                 1,000 (1,000) 0                
Extensions and discoveries(b) 1,633,426,000 954,378,000 517,178,000   1,519,681,000       11,410,000 88,187,000       1,567,634,000 873,104,000           517,023,000       9,623,000 12,992,000           0       1,343,000 553,000           27,000      
Proved Developed and Undeveloped Reserves, Production (172,380,000) (156,325,000) (153,504,000)                     168,737,000 155,052,000 152,940,000                 438,000 111,000 0                 170,000 100,000 94,000                
Sale of reserves in-place 0 0 (531,431,000)                     0 0 531,431,000                 0 0 0                 0 0 0