ACCUMULATED OTHER COMPREHENSIVE LOSS, Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]
Balance		$ 158,434
Other comprehensive income before reclassifications		1,632
Amount reclassified from accumulated other comprehensive loss		61
Net current period other comprehensive income		1,693	$ 1,506
Balance		160,828
Accumulated Other Comprehensive Income (Loss) [Member]
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]
Balance		(31,297)
Balance		(29,604)
Foreign Currency Translation Adjustment [Member]
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]
Balance		(28,976)
Other comprehensive income before reclassifications		1,910
Amount reclassified from accumulated other comprehensive loss		0
Net current period other comprehensive income		1,910
Balance		(27,066)
Unrealized Holding Gains on Available-for-Sale Securities [Member]
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]
Balance		424
Other comprehensive income before reclassifications		(279)
Amount reclassified from accumulated other comprehensive loss		0
Net current period other comprehensive income		(279)
Balance		145
Unfunded SERP Liability [Member]
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]
Balance		(2,745)
Other comprehensive income before reclassifications		1
Amount reclassified from accumulated other comprehensive loss	[1]	61
Net current period other comprehensive income		62
Balance		$ (2,683)

[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.