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Financial Information by Business Segment - Schedule of Segment Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
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Operating segments information |  |
Total assets | $ 13,572,330 | $ 12,064,900
Operating segments |  |
Operating segments information |  |
Total assets | 11,527,152 | 10,862,251
Operating segments | EQT Production |  |
Operating segments information |  |
Total assets | 8,538,111 | 8,153,199
Operating segments | EQT Midstream |  |
Operating segments information |  |
Total assets | 2,989,041 | 2,709,052
Headquarters assets, including cash and short-term investments |  |
Operating segments information |  |
Total assets | $ 2,045,178 | $ 1,202,649

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