ACCUMULATED OTHER COMPREHENSIVE LOSS, Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]
Balance				$ 158,434
Other comprehensive income before reclassifications				10,748
Amount reclassified from accumulated other comprehensive loss				183
Net current period other comprehensive income		$ 3,504	$ (77)	10,931	$ (2,521)
Balance		178,095		178,095
Accumulated Other Comprehensive Income (Loss) [Member]
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]
Balance				(31,297)
Balance		(20,366)		(20,366)
Foreign Currency Translation Adjustment [Member]
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]
Balance				(28,976)
Other comprehensive income before reclassifications				11,047
Amount reclassified from accumulated other comprehensive loss				0
Net current period other comprehensive income				11,047
Balance		(17,929)		(17,929)
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				(300)
Amount reclassified from accumulated other comprehensive loss				0
Net current period other comprehensive income				(300)
Balance		124		124
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]			183
Net current period other comprehensive income				184
Balance		$ (2,561)		$ (2,561)

[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.