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PROPERTY, PLANT AND EQUIPMENT - Property, plant and equipment are presented at cost, net of accumulated depreciation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 40,765	$ 38,613
Less: accumulated depreciation	(26,213)	(24,395)
Net property, plant and equipment	14,552	14,218
Land
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	878	878
Buildings
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 19,705	19,611
Buildings | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	7 years
Buildings | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	40 years
Operating equipment and property
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 11,016	10,360
Operating equipment and property | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	3 years
Operating equipment and property | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	13 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 1,785	1,488
Furniture and fixtures | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	5 years
Furniture and fixtures | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	7 years
Vehicles
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 7,381	$ 6,276
Vehicles | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	5 years
Vehicles | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	10 years

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.14)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- Definition

Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(8))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Paragraph 1
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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

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