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Supplemental Gas Data Proved Undeveloped Reserves (Details) MMcf in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 USD ($) MMcf | Dec. 31, 2015 USD ($) MMcf | Dec. 31, 2014 USD ($) MMcf | Dec. 31, 2013 MMcf | Jan. 02, 2013 MMcf
Reserve Quantities [Line Items] |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment | $ | $ 226,820,000 | $ 982,934,000 | $ 1,459,452,000 |  |
Proved Developed and Undeveloped Reserves, Sales of Minerals in Place | (870,884) |  |  |  |
Proved Developed and Undeveloped Reserves, Purchases of Minerals in Place | 1,443,642 |  |  |  |
Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions | 720,146 | 934,542 | 1,098,436 |  |
Proved Developed and Undeveloped Reserves, Production | 394,387 | 328,657 | 235,714 |  |
Beginning reserves | 6,251,648 | 5,642,989 | 6,827,616 | 5,731,214 |
Proved Developed and Undeveloped Reserves, Revisions of Previous Estimates | (99,849) | 1,368,909 | 218,168 |  |
Proved Developed and Undeveloped Reserves, Improved Recovery | 190,009 | (3,159,421) | 15,512 |  |
proved undeveloped [Member] |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment | $ | $ 58,694 |  |  |  |
Proved Undeveloped Reserve (Volume) | 2,568,346 |  |  |  | 1,945,837
undeveloped reserves transferred to developed | (211,876) |  |  |  |
Proved Developed and Undeveloped Reserves, Sales of Minerals in Place | (199,401) |  |  |  |
Proved Developed and Undeveloped Reserves, Purchases of Minerals in Place | 547,680 |  |  |  |
Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions | 669,266 |  |  |  |
Beginning reserves | 2,568,346 | 1,945,837 | 3,628,910 |  |
Price Changes [Member] |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions | 188,066 |  |  |  |
Plan and Other Revisions [Member] |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions | 4,906 |  |  |  |
Proved Developed [Member] |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Beginning reserves | 3,683,302 | 3,697,152 | 3,198,706 |  |
Natural Gas [Member] |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Proved Developed and Undeveloped Reserves, Sales of Minerals in Place | (711,155) |  |  |  |
Proved Developed and Undeveloped Reserves, Purchases of Minerals in Place | 1,352,759 |  |  |  |
Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions | 643,688 | 840,800 |  |  |
Proved Developed and Undeveloped Reserves, Production | 358,474 | 285,041 | 216,260 |  |
Beginning reserves | 5,828,398 | 5,060,214 | 6,317,600 | 5,585,107 |
Proved Developed and Undeveloped Reserves, Revisions of Previous Estimates | 21,280 | 1,052,978 | (46,560) |  |
Proved Developed and Undeveloped Reserves, Improved Recovery | 179,914 | (2,866,123) | 15,512 |  |
Natural Gas [Member] | proved undeveloped [Member] |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Beginning reserves | 2,349,934 | 1,749,320 | 3,337,694 |  |
Natural Gas [Member] | Plan and Other Revisions [Member] |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions |  |  | 979,801 |  |
Natural Gas [Member] | Proved Developed [Member] |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Beginning reserves | 3,478,464 | 3,310,894 | 2,979,906 |  |
Natural Gas Liquids [Member] |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Proved Developed and Undeveloped Reserves, Sales of Minerals in Place | (22,382) |  |  |  |
Proved Developed and Undeveloped Reserves, Purchases of Minerals in Place | 13,177 |  |  |  |
Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions | 10,960 | 13,916 |  |  |
Proved Developed and Undeveloped Reserves, Production | 5,119 | 5,812 | 2,578 |  |
Beginning reserves | 60,532 | 86,212 | 77,790 | 21,546 |
Proved Developed and Undeveloped Reserves, Revisions of Previous Estimates | (20,669) | 45,993 | 40,363 |  |
Proved Developed and Undeveloped Reserves, Improved Recovery | 1,647 | (45,675) | 0 |  |
Natural Gas Liquids [Member] | proved undeveloped [Member] |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Beginning reserves | 29,866 | 27,016 | 45,385 |  |
Natural Gas Liquids [Member] | Plan and Other Revisions [Member] |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions |  |  | 18,459 |  |
Natural Gas Liquids [Member] | Proved Developed [Member] |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Beginning reserves | 30,666 | 59,196 | 32,405 |  |
Crude Oil [Member] |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Proved Developed and Undeveloped Reserves, Sales of Minerals in Place | (4,240) |  |  |  |
Proved Developed and Undeveloped Reserves, Purchases of Minerals in Place | 1,970 |  |  |  |
Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions | 1,783 | 1,707 |  |  |
Proved Developed and Undeveloped Reserves, Production | 867 | 1,458 | 664 |  |
Beginning reserves | 10,007 | 10,915 | 7,212 | 2,806 |
Proved Developed and Undeveloped Reserves, Revisions of Previous Estimates | 481 | 6,662 | 3,756 |  |
Proved Developed and Undeveloped Reserves, Improved Recovery | 35 | (3,208) | 0 |  |
Crude Oil [Member] | proved undeveloped [Member] |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Beginning reserves | 6,536 | 5,736 | 3,151 |  |
Crude Oil [Member] | Plan and Other Revisions [Member] |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions |  |  | 1,314 |  |
Crude Oil [Member] | Proved Developed [Member] |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Beginning reserves | 3,474 | 5,180 | 4,061 |  |

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