v3.5.0.2

PROPERTY, PLANT AND EQUIPMENT, INTANGIBLE ASSETS - Schedule of property, plant and equipment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Mar. 31, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Property, plant and equipment, net |  |  |  |  |  |
Property, plant and equipment, gross | $ 432,494 |  |  | $ 432,494 |  | $ 509,805
Accumulated depreciation | (32,612) |  |  | (32,612) |  | (24,650)
Total property, plant and equipment, net | 399,882 |  |  | 399,882 |  | 485,155
Asset impairment |  |  |  | 107,477 |  |
Depreciation expense | 3,600 |  | $ 4,300 | 8,000 | $ 6,900 |
Gathering pipelines and related equipment |  |  |  |  |  |
Property, plant and equipment, net |  |  |  |  |  |
Property, plant and equipment, gross | 284,010 |  |  | $ 284,010 |  | 319,058
Property, plant and equipment, Estimated useful lives |  |  |  | 45 years |  |
Gas processing and compression facilities |  |  |  |  |  |
Property, plant and equipment, net |  |  |  |  |  |
Property, plant and equipment, gross | 131,673 |  |  | $ 131,673 |  | 173,679
Property, plant and equipment, Estimated useful lives |  |  |  | 20 years |  |
Buildings |  |  |  |  |  |
Property, plant and equipment, net |  |  |  |  |  |
Property, plant and equipment, gross | 2,144 |  |  | $ 2,144 |  | 2,175
Property, plant and equipment, Estimated useful lives |  |  |  | 30 years |  |
Other depreciable assets |  |  |  |  |  |
Property, plant and equipment, net |  |  |  |  |  |
Property, plant and equipment, gross | 5,632 |  |  | $ 5,632 |  | 5,589
Other depreciable assets | Minimum |  |  |  |  |  |
Property, plant and equipment, net |  |  |  |  |  |
Property, plant and equipment, Estimated useful lives |  |  |  | 3 years |  |
Other depreciable assets | Maximum |  |  |  |  |  |
Property, plant and equipment, net |  |  |  |  |  |
Property, plant and equipment, Estimated useful lives |  |  |  | 15 years |  |
Land and rights of way |  |  |  |  |  |
Property, plant and equipment, net |  |  |  |  |  |
Property, plant and equipment, gross | 9,027 |  |  | $ 9,027 |  | 9,027
Construction in progress |  |  |  |  |  |
Property, plant and equipment, net |  |  |  |  |  |
Property, plant and equipment, gross | $ 8 |  |  | $ 8 |  | $ 277
Gathering & Processing |  |  |  |  |  |
Property, plant and equipment, net |  |  |  |  |  |
Asset impairment |  | $ 78,300 |  |  |  |

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