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Financial Information by Business Segment - Schedule of Segment Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
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Segment assets: |  |
Total assets | $ 14,783,186 | $ 13,976,172
Operating Segments |  |
Segment assets: |  |
Total assets | 12,376,298 | 12,221,991
Operating Segments | EQT Production |  |
Segment assets: |  |
Total assets | 8,800,022 | 8,995,853
Operating Segments | EQT Midstream |  |
Segment assets: |  |
Total assets | 3,576,276 | 3,226,138
Headquarters assets, including cash and short-term investments |  |
Segment assets: |  |
Total assets | $ 2,406,888 | $ 1,754,181

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