ACCUMULATED OTHER COMPREHENSIVE LOSS, Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]
Balance at beginning of period		$ 176,470	$ 157,960
Other comprehensive income before reclassifications		546
Amount reclassified comprehensive loss from accumulated other		31
Net current period other comprehensive income		577	4,072
Balance at end of period		178,153	164,175
ASU 2018-02 [Member]
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]
Effect of adoption of ASU 2018-02 (Topic 220)				$ 0
Accumulated Other Comprehensive (Loss) [Member]
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]
Balance at beginning of period		(24,838)	(19,625)
Balance at end of period		(24,724)	$ (15,553)
Accumulated Other Comprehensive (Loss) [Member] | ASU 2018-02 [Member]
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]
Effect of adoption of ASU 2018-02 (Topic 220)		(463)		$ (463)
Foreign Currency Translation Adjustment [Member]
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]
Balance at beginning of period		(22,635)
Other comprehensive income before reclassifications		540
Amount reclassified comprehensive loss from accumulated other		0
Net current period other comprehensive income		540
Balance at end of period		(22,095)
Foreign Currency Translation Adjustment [Member] | ASU 2018-02 [Member]
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]
Effect of adoption of ASU 2018-02 (Topic 220)		0
Unrealized Holding Gains on Available-for-Sale Securities [Member]
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]
Balance at beginning of period		12
Other comprehensive income before reclassifications		0
Amount reclassified comprehensive loss from accumulated other		0
Net current period other comprehensive income		0
Balance at end of period		12
Unrealized Holding Gains on Available-for-Sale Securities [Member] | ASU 2018-02 [Member]
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]
Effect of adoption of ASU 2018-02 (Topic 220)		0
Unfunded SERP Liability [Member]
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]
Balance at beginning of period		(2,215)
Other comprehensive income before reclassifications		6
Amount reclassified comprehensive loss from accumulated other	[1]	31
Net current period other comprehensive income		37
Balance at end of period		(2,641)
Unfunded SERP Liability [Member] | ASU 2018-02 [Member]
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]
Effect of adoption of ASU 2018-02 (Topic 220)		$ (463)

[1] This reclassification relates to the amortization of prior service costs and gains/losses associated with the Company's SERP plan. This expense is allocated between cost of sales and selling, general and administrative expense based upon the employment classification of the plan participants.