LEASES - Schedule of operating lease weighted average remaining lease terms and discount rates (Details)	Jun. 30, 2019
Lease facilities
Lessee, Lease, Description [Line Items]
Weighted average remaining lease terms (years)	5 years 9 months 4 days
Weighted average discount rate	9.10%
Lease equipment
Lessee, Lease, Description [Line Items]
Weighted average remaining lease terms (years)	2 years 8 months 1 day
Weighted average discount rate	8.00%
Lease plant
Lessee, Lease, Description [Line Items]
Weighted average remaining lease terms (years)	13 years 9 months 4 days
Weighted average discount rate	9.37%
Lease railcar
Lessee, Lease, Description [Line Items]
Weighted average remaining lease terms (years)	1 year 10 months 13 days
Weighted average discount rate	8.00%

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No definition available.

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- Definition

Weighted average discount rate for operating lease calculated at point in time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(4)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 55
-Paragraph 53
-URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971

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- Definition

Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 55
-Paragraph 53
-URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980

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