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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

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- Definition 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. + References 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) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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