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ACCUMULATED OTHER COMPREHENSIVE LOSS, Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Accumulated other comprehensive loss [Abstract]
Foreign currency translation adjustment, net of taxes of ($789) at June 30, 2018 and ($801) at December 31, 2017	$ (19,968)	$ (16,537)
Unrealized holding gains on available-for-sale securities, net of taxes of $65 at June 30, 2018 and $85 at December 31, 2017	114	145
Unfunded SERP liability, net of taxes of ($1,584) at June 30, 2018 and ($1,635) at December 31, 2017	(3,062)	(3,233)
Accumulated other comprehensive loss	(22,916)	(19,625)
Accumulated other comprehensive loss, tax [Abstract]
Foreign currency translation adjustment, tax	(789)	(801)
Unrealized holding gains on available-for-sale securities, tax	65	85
Change in unfunded SERP liability, tax	$ (1,584)	$ (1,635)

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- Definition

Tax effect of accumulated appreciation or loss in value of total available-for-sale securities at the end of an accounting period.

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Tax effect of accumulated appreciation or loss in value of foreign currency translation adjustment at the end of an accounting period.

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Tax portion in relation to net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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Accumulated unrealized gain (loss), after tax, on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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