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Supplemental Gas Data Results of Operations (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |  |
Production Revenue | $ 793,673 | $ 728,458 | $ 1,007,381
Gain (Loss) on Hedging Activity | (141,021) | 392,942 | 23,193
Gas Royalty Interests and Purchased Gas Sales | 43,256 | 14,450 | 8,999
Total Revenue | 695,908 | 1,135,850 | 1,039,573
Lifting Costs | 96,434 | 121,847 | 139,242
Production Tax Expense | 31,049 | 30,438 | 39,418
Gathering Costs | 374,350 | 343,403 | 239,591
E&P Direct Administration and Selling | 14,519 | 10,120 | 22,718
Other Costs |  | 370,374 | 323,600
Impairment of Oil and Gas Properties | 0 | 828,905 | 0
DD&A | 976,922 | 1,715,808 | 771,820
Total Costs | (281,014) | (579,958) | 267,753
Pre-tax Operating Income | (69,308) | (250,220) | 45,162
Income Taxes | (211,706) | (329,738) | 222,591
Cnx Gas Guarantor [Member] |  |  |
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |  |
Gain (Loss) on Hedging Activity | (141,021) | 392,942 | 23,193
Gas Royalty Interests and Purchased Gas Sales | 43,256 | 14,450 | 8,999
Production Tax Expense | 31,049 | 30,438 | 39,418
Gain (Loss) on Sale of Assets | 42,717 | 10,721 | 7,251
Other Costs | 417,853 |  |
Impairment of Oil and Gas Properties | $ 0 | $ 828,905 | $ 0

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- Definition Royalty expense incurred and are directly related to goods produced and sold and services rendered during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2921-110230 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 35 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28370743&loc=d3e66150-109466 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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