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Supplemental Gas Data Average Unit Prices (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) MMcf | Dec. 31, 2015 USD ($) MMcf | Dec. 31, 2014 USD ($) MMcf | Dec. 31, 2013 MMcf
Average Sales Price and Production Costs Per Unit of Production [Line Items] |  |  |  |
Proved Developed and Undeveloped Reserves, Sales of Minerals in Place | (870,884,000) |  |  |
Oil and Gas Delivery Commitments and Contracts, Remaining Contractual Volume | 431.4 |  |  |
Proved Developed and Undeveloped Reserves, Production | 394,387,000 | 328,657,000 | 235,714,000 |
Proved Developed and Undeveloped Reserves, Purchases of Minerals in Place | 1,443,642,000 |  |  |
Beginning reserves | 6,251,648,000 | 5,642,989,000 | 6,827,616,000 | 5,731,214,000
Proved Developed and Undeveloped Reserves, Revisions of Previous Estimates | (99,849,000) | 1,368,909,000 | 218,168,000 |
Proved Developed and Undeveloped Reserves, Improved Recovery | 190,009,000 | (3,159,421,000) | 15,512,000 |
Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions | 720,146,000 | 934,542,000 | 1,098,436,000 |
Plan and Other Revisions [Member] |  |  |  |
Average Sales Price and Production Costs Per Unit of Production [Line Items] |  |  |  |
Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions | 4,906,000 |  |  |
Natural Gas [Member] |  |  |  |
Average Sales Price and Production Costs Per Unit of Production [Line Items] |  |  |  |
Proved Developed and Undeveloped Reserves, Sales of Minerals in Place | (711,155,000) |  |  |
Proved Developed and Undeveloped Reserves, Production | 358,474,000 | 285,041,000 | 216,260,000 |
Proved Developed and Undeveloped Reserves, Purchases of Minerals in Place | 1,352,759,000 |  |  |
Beginning reserves | 5,828,398,000 | 5,060,214,000 | 6,317,600,000 | 5,585,107,000
Proved Developed and Undeveloped Reserves, Revisions of Previous Estimates | 21,280,000 | 1,052,978,000 | (46,560,000) |
Proved Developed and Undeveloped Reserves, Improved Recovery | 179,914,000 | (2,866,123,000) | 15,512,000 |
Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions | 643,688,000 | 840,800,000 |  |
Natural Gas [Member] | Plan and Other Revisions [Member] |  |  |  |
Average Sales Price and Production Costs Per Unit of Production [Line Items] |  |  |  |
Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions |  |  | 979,801,000 |
Natural Gas, Per Thousand Cubic Feet [Member] |  |  |  |
Average Sales Price and Production Costs Per Unit of Production [Line Items] |  |  |  |
Average Gas Sales Price before effects of financial settlements | $ | $ 2.01 | $ 2.22 | $ 4.27 |
Average effects of financial settlements (per thousand cubic feet) | $ | 0.62 | 0.60 | 0.10 |
Average gas sales price including effects of financial settlements (per thousand cubic feet) | $ | $ 2.63 | $ 2.82 | $ 4.37 |
Average lifting costs, excluding ad valorem and severance taxes (per thousand cubic feet) | .24 | .37 | .59 |
Natural Gas Liquids [Member] |  |  |  |
Average Sales Price and Production Costs Per Unit of Production [Line Items] |  |  |  |
Proved Developed and Undeveloped Reserves, Sales of Minerals in Place | (22,382,000) |  |  |
Proved Developed and Undeveloped Reserves, Production | 5,119,000 | 5,812,000 | 2,578,000 |
Proved Developed and Undeveloped Reserves, Purchases of Minerals in Place | 13,177,000 |  |  |
Beginning reserves | 60,532,000 | 86,212,000 | 77,790,000 | 21,546,000
Proved Developed and Undeveloped Reserves, Revisions of Previous Estimates | (20,669,000) | 45,993,000 | 40,363,000 |
Proved Developed and Undeveloped Reserves, Improved Recovery | 1,647,000 | (45,675,000) | 0 |
Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions | 10,960,000 | 13,916,000 |  |
Natural Gas Liquids [Member] | Plan and Other Revisions [Member] |  |  |  |
Average Sales Price and Production Costs Per Unit of Production [Line Items] |  |  |  |
Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions |  |  | 18,459,000 |
Crude Oil [Member] |  |  |  |
Average Sales Price and Production Costs Per Unit of Production [Line Items] |  |  |  |
Proved Developed and Undeveloped Reserves, Sales of Minerals in Place | (4,240,000) |  |  |
Proved Developed and Undeveloped Reserves, Production | 867,000 | 1,458,000 | 664,000 |
Proved Developed and Undeveloped Reserves, Purchases of Minerals in Place | 1,970,000 |  |  |
Beginning reserves | 10,007,000 | 10,915,000 | 7,212,000 | 2,806,000
Proved Developed and Undeveloped Reserves, Revisions of Previous Estimates | 481,000 | 6,662,000 | 3,756,000 |
Proved Developed and Undeveloped Reserves, Improved Recovery | 35,000 | (3,208,000) | 0 |
Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions | 1,783,000 | 1,707,000 |  |
Crude Oil [Member] | Plan and Other Revisions [Member] |  |  |  |
Average Sales Price and Production Costs Per Unit of Production [Line Items] |  |  |  |
Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions |  |  | 1,314,000 |

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