OTHER INCOME (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Other Income and Expenses [Abstract]
Equity investment income	$ 974	$ 1,067	$ 1,849	$ 2,183
Gain (Loss) on Disposition of Assets	397	(4)	767	177
Building rental income	479	410	734	988
Interest income	301	532	641	1,149
Other (expense) income	(82)	472	(926)	5,730
Nonoperating Income (Expense)	$ 2,069	$ 2,477	$ 3,065	$ 10,227

Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
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-URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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Amount of interest income earned from interest bearing assets classified as other.

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Amount of income (expense) related to nonoperating activities, classified as other.

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