COMMITMENTS AND CONTINGENCIES (Commitments Due) (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Property, Plant and Equipment [Member]
Recorded Unconditional Purchase Obligation [Line Items]
2018	$ 134,458
Thereafter	0
Total	134,458
Noncapital [Member]
Recorded Unconditional Purchase Obligation [Line Items]
2018	10,449
2019-2020	15,109
2021–2022	3,587
Thereafter	3,000
Total	$ 32,145

Amount of the recorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25383-109308

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Amount of the recorded unconditional purchase obligation maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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- Definition

Amount of the recorded unconditional purchase obligation maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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- Definition

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+ References

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Amount of the recorded unconditional purchase obligation maturing in the fourth and fifth year after the current fiscal year.

+ References

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Amount of the recorded unconditional purchase obligation maturing in the second and third year after the current fiscal year.

+ References

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- Definition

Amount of the recorded unconditional purchase obligation maturing after the first fiscal years following the latest fiscal year.

+ References

No definition available.

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