PROPERTY, PLANT AND EQUIPMENT AND INTANGIBLE ASSETS - Narrative - Intangible Assets (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 |
|
| Goodwill and Finite-Lived Intangible Assets | |||||
| Elimination of intangible asset as part of assignment of common and subordinated units and IDR units from NuDevco to the Partnership | $ 28,745 | ||||
| Amortization expense | $ 1,600 | $ 1,600 | $ 2,200 | ||
| Customer Relationships | |||||
| Goodwill and Finite-Lived Intangible Assets | |||||
| Impairment of intangible asset | $ 29,200 | ||||
| Elimination of intangible asset as part of assignment of common and subordinated units and IDR units from NuDevco to the Partnership | $ 28,700 | ||||