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COMMITMENTS AND CONTINGENCIES (Details) - USD ($) | 1 Months Ended |
--- | --- | ---
Jan. 31, 2018 | Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract] |  |
Purchase orders outstanding for equipment, parts and supplies |  | $ 21,800,000
Contingent gains recognized in consolidated financial statements |  | $ 0
Litigation settlement | $ 21,000,000.0 |

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- Definition Amount of gain recognized in the period that had been disclosed in prior periods as a contingent gain. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6397426&loc=d3e17499-108355 + Details
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