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ORGANIZATION AND BASIS OF PRESENTATION. (Details 3) | 12 Months Ended
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Dec. 31, 2018
Building [Member] |
Estimated useful lives | P40Y
Facilities and plant equipment [Member] | Minimum [Member] |
Estimated useful lives | P10Y
Facilities and plant equipment [Member] | Maximum [Member] |
Estimated useful lives | P25Y
Other equipment, vehicles and furniture [Member] | Minimum [Member] |
Estimated useful lives | P5Y
Other equipment, vehicles and furniture [Member] | Maximum [Member] |
Estimated useful lives | P10Y

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- Definition Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 35 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68071081&loc=d3e1205-110223 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 + Details
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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