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FORMATION OF PDMCX JOINT VENTURE (Details) - USD ($) $ in Millions | May 31, 2017 | Apr. 30, 2017
--- | --- | ---
Subsequent Event [Member] |  |
Noncontrolling Interest [Line Items] |  |
Investment funding term | 5 years |
PDMC [Member] | Subsequent Event [Member] |  |
Noncontrolling Interest [Line Items] |  |
Ownership percentage in joint venture | 50.01% |
DNP [Member] |  |
Noncontrolling Interest [Line Items] |  |
Ownership percentage of noncontrolling interests |  | 49.99%
DNP [Member] | Subsequent Event [Member] |  |
Noncontrolling Interest [Line Items] |  |
Ownership percentage of noncontrolling interests | 49.99% |
PDMCX [Member] | Subsequent Event [Member] |  |
Noncontrolling Interest [Line Items] |  |
Planned amount of investment in joint venture | $ 160 |

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