ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Accumulated other comprehensive loss [Abstract]
Foreign currency translation adjustment, net of taxes of ($336) at June 30, 2016 and ($336) at December 31, 2015		$ (22,348)		$ (22,348)		$ (19,305)
Unrealized holding gains on available-for-sale securities, net of taxes of $325 at June 30, 2016 and $265 at December 31, 2015		532		532		434
Unfunded SERP liability, net of taxes of ($1,223) at June 30, 2016 and ($1,327) at December 31, 2015		(2,505)		(2,505)		(3,005)
Accumulated other comprehensive loss		(24,321)		(24,321)		(21,876)	[1]
Accumulated other comprehensive loss, tax [Abstract]
Foreign currency translation adjustment, tax		(336)		(336)		(336)
Unrealized holding gains on available-for-sale securities, tax		325		325		265
Unfunded SERP liability, tax		(1,223)		(1,223)		$ (1,327)
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]
Balance at beginning of period	[1]			233,122
Other comprehensive income before reclassifications				(2,576)
Amount reclassified from accumulated other comprehensive loss				131
Net current period other comprehensive income		(3,951)	$ 3,569	(2,445)	$ (6,648)
Balance at end of period		152,540		152,540
AOCI Attributable to Parent [Member]
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]
Balance at beginning of period				(21,876)
Balance at end of period		(24,321)		(24,321)
Foreign Currency Translation Adjustment [Member]
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]
Balance at beginning of period				(19,305)
Other comprehensive income before reclassifications				(3,043)
Amount reclassified from accumulated other comprehensive loss				0
Net current period other comprehensive income				(3,043)
Balance at end of period		(22,348)		(22,348)
Unrealized Holding Gains on Available-for-Sale Securities [Member]
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]
Balance at beginning of period				434
Other comprehensive income before reclassifications				98
Amount reclassified from accumulated other comprehensive loss				0
Net current period other comprehensive income				98
Balance at end of period		532		532
Unfunded SERP Liability [Member]
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]
Balance at beginning of period				(3,005)
Other comprehensive income before reclassifications				369
Amount reclassified from accumulated other comprehensive loss	[2]			131
Net current period other comprehensive income				500
Balance at end of period		$ (2,505)		$ (2,505)

[1] (Revised)

[2] 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.