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Financial Information by Business Segment - Schedule of Revenue from External Customers and Operating Income (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) segment | Jun. 30, 2015 USD ($)
Segment Reporting [Abstract] |  |  |  |
Number of operating segments | segment |  |  | 2 |
Revenues: |  |  |  |
Sales of natural gas, oil and NGLs | $ 304,532 | $ 373,756 | $ 668,959 | $ 960,164
Pipeline and marketing services | 57,692 | 61,573 | 129,339 | 146,389
Gain (loss) on derivatives not designated as hedges | (234,693) | 4,259 | (125,698) | 47,851
Total operating revenues | 127,531 | 439,588 | 672,600 | 1,154,404
Reconciliation of operating (loss) income to net (loss) income: |  |  |  |
Total operating (loss) income | (324,492) | 33,034 | (197,291) | 347,793
Other income | 7,644 | 2,689 | 12,484 | 3,628
Interest expense | 36,305 | 36,833 | 72,485 | 74,049
Income tax (benefit) | (172,346) | (64,857) | (164,910) | (7,543)
Net (loss) income | (180,807) | 63,747 | (92,382) | 284,915
Operating Segments | EQT Production |  |  |  |
Revenues: |  |  |  |
Sales of natural gas, oil and NGLs | 304,532 | 373,756 | 668,959 | 960,164
Pipeline and marketing services | 2,123 | 9,822 | 6,709 | 22,959
Gain (loss) on derivatives not designated as hedges | (234,693) | 5,177 | (125,698) | 49,423
Total operating revenues | 71,962 | 388,755 | 549,970 | 1,032,546
Reconciliation of operating (loss) income to net (loss) income: |  |  |  |
Total operating (loss) income | (444,000) | (66,886) | (455,254) | 118,957
Operating Segments | EQT Midstream |  |  |  |
Revenues: |  |  |  |
Sales of natural gas, oil and NGLs | 0 | 0 | 0 | 0
Pipeline and marketing services | 214,298 | 193,348 | 439,027 | 402,228
Gain (loss) on derivatives not designated as hedges | 0 | (918) | 0 | (1,572)
Total operating revenues | 214,298 | 192,430 | 439,027 | 400,656
Reconciliation of operating (loss) income to net (loss) income: |  |  |  |
Total operating (loss) income | 124,528 | 108,192 | 266,387 | 237,931
Intersegment Eliminations |  |  |  |
Revenues: |  |  |  |
Sales of natural gas, oil and NGLs | 0 | 0 | 0 | 0
Pipeline and marketing services | (158,729) | (141,597) | (316,397) | (278,798)
Gain (loss) on derivatives not designated as hedges | 0 | 0 | 0 | 0
Total operating revenues | (158,729) | (141,597) | (316,397) | (278,798)
Unallocated Expenses |  |  |  |
Reconciliation of operating (loss) income to net (loss) income: |  |  |  |
Total operating (loss) income | $ (5,020) | $ (8,272) | $ (8,424) | $ (9,095)

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