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Supplemental Gas Data Acreages (Details) number in Thousands, a in Thousands, $ in Thousands | Dec. 31, 2016 USD ($) a | Dec. 31, 2015 USD ($)
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Gas and Oil Acreage [Line Items] |  |
Unproved Oil and Gas Property, Successful Effort Method | $ | $ 1,116,282 | $ 1,421,083
Proved Oil and Gas Property, Successful Effort Method | $ | $ 2,016,916 | $ 1,922,602
Productive Gas Wells, Number of Wells, Gross | 17,314 |
Gas and Oil Acreage, Undeveloped, Net | 30,038 |
unproved acreage gross | 4,804,804 |
Gas and Oil Acreage, Unproved, Net | 3,745,533 |
Total Acreage - Gross | 5,389,087 |
Total Acreage - Net | 4,316,853 |
Productive Gas Wells, Number of Wells, Net | 12,846 |
Productive Oil Wells, Number of Wells, Gross | 189 |
Productive Oil Wells, Number of Wells, Net | 30 |
Gas and Oil Area, Developed, Gross | 549,816 |
Gas and Oil Area, Developed, Net | 541,282 |
Gas and Oil Area, Undeveloped, Gross | 34,467 |

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- Definition Area spaced or assigned to productive wells in which a working interest is owned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1208 -Paragraph (a) + Details
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- Definition Fractional interest owned based on working interests or other economic arrangements of area spaced or assigned to productive wells. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1208 -Paragraph (a) + Details
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- Definition Lease area in which a working interest is owned and on which wells have not been drilled or completed to a point that would permit the production of commercial quantities of oil and gas regardless of whether or not such area contains proved reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1208 -Paragraph (b) + Details
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- Definition Fractional interest owned based on working interests or other economic arrangements of lease area on which wells have not been drilled or completed to a point that would permit the production of commercial quantities of oil and gas regardless of whether or not such area contains proved reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1208 -Paragraph (b) + Details
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- Definition The total number of producing gas wells and gas wells capable of production, in which the entity owns an undivided working interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1208 -Paragraph (a) + Details
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- Definition The total number of producing oil wells and oil wells capable of production, in which the entity owns an undivided working interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1208 -Paragraph (a) + Details
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- Definition Oil and Gas properties with proved reserves under the successful effort method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Glossary Proved Properties -URI http://asc.fasb.org/extlink&oid=6522428 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=56951519&loc=d3e64746-109465 + Details
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