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Financial Information by Business Segment - Schedule of Segment Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Segment assets: |  |
Total assets | $ 15,646,614 | $ 15,472,922
Operating Segments |  |
Segment assets: |  |
Total assets | 14,270,968 | 13,548,711
Operating Segments | EQT Production |  |
Segment assets: |  |
Total assets | 11,577,963 | 10,923,824
Operating Segments | EQT Gathering |  |
Segment assets: |  |
Total assets | 1,279,944 | 1,225,686
Operating Segments | EQT Transmission |  |
Segment assets: |  |
Total assets | 1,413,061 | 1,399,201
Headquarters assets, including cash and short-term investments |  |
Segment assets: |  |
Total assets | $ 1,375,646 | $ 1,924,211

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