ACCUMULATED OTHER COMPREHENSIVE LOSS, Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]
Balance				$ 158,434
Other comprehensive income before reclassifications				7,304
Amount reclassified from accumulated other comprehensive loss				123
Net current period other comprehensive income		$ 5,734	$ (3,951)	7,427	$ (2,445)
Balance		169,623		169,623
Accumulated Other Comprehensive Income (Loss) [Member]
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]
Balance				(31,297)
Balance		(23,870)		(23,870)
Foreign Currency Translation Adjustment [Member]
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]
Balance				(28,976)
Other comprehensive income before reclassifications				7,571
Amount reclassified from accumulated other comprehensive loss				0
Net current period other comprehensive income				7,571
Balance		(21,405)		(21,405)
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				(267)
Amount reclassified from accumulated other comprehensive loss				0
Net current period other comprehensive income				(267)
Balance		157		157
Unfunded SERP Liability [Member]
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]
Balance				(2,745)
Other comprehensive income before reclassifications				0
Amount reclassified from accumulated other comprehensive loss	[1]			123
Net current period other comprehensive income				123
Balance		$ (2,622)		$ (2,622)

[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.