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Financial Information by Business Segment - Schedule of Revenue from External Customers and Operating Income (Details) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 USD ($) segment | Mar. 31, 2016 USD ($)
Segment Reporting [Abstract] |  |
Number of operating segments | segment | 3 |
Revenues: |  |
Sales of natural gas, oil and NGLs | $ 673,465 | $ 364,427
Pipeline and net marketing services | 83,316 | 71,647
Gain on derivatives not designated as hedges | 140,742 | 108,995
Total operating revenues | 897,523 | 545,069
Reconciliation of operating (loss) income to net (loss) income: |  |
Total operating income | 390,644 | 127,201
Other income | 3,381 | 4,840
Interest expense | 42,655 | 36,180
Income tax expense | 100,665 | 7,436
Net income | 250,705 | 88,425
Operating Segments | EQT Production |  |
Revenues: |  |
Sales of natural gas, oil and NGLs | 673,465 | 364,427
Pipeline and net marketing services | 14,455 | 10,285
Gain on derivatives not designated as hedges | 140,742 | 108,995
Total operating revenues | 828,662 | 483,707
Reconciliation of operating (loss) income to net (loss) income: |  |
Total operating income | 257,430 | (5,478)
Operating Segments | EQT Gathering |  |
Revenues: |  |
Sales of natural gas, oil and NGLs | 0 | 0
Pipeline and net marketing services | 102,329 | 98,009
Gain on derivatives not designated as hedges | 0 | 0
Total operating revenues | 102,329 | 98,009
Reconciliation of operating (loss) income to net (loss) income: |  |
Total operating income | 73,589 | 72,604
Operating Segments | EQT Transmission |  |
Revenues: |  |
Sales of natural gas, oil and NGLs | 0 | 0
Pipeline and net marketing services | 101,097 | 87,777
Gain on derivatives not designated as hedges | 0 | 0
Total operating revenues | 101,097 | 87,777
Reconciliation of operating (loss) income to net (loss) income: |  |
Total operating income | 71,524 | 64,516
Intersegment Eliminations |  |
Revenues: |  |
Sales of natural gas, oil and NGLs | 0 | 0
Pipeline and net marketing services | (134,565) | (124,424)
Gain on derivatives not designated as hedges | 0 | 0
Total operating revenues | (134,565) | (124,424)
Unallocated Expenses |  |
Reconciliation of operating (loss) income to net (loss) income: |  |
Total operating income | $ (11,899) | $ (4,441)

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