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ACCUMULATED OTHER COMPREHENSIVE LOSS, Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Changes in Accumulated Other Comprehensive (Loss) Income by Component [Roll Forward]
Balance		$ 157,960	$ 158,434
Other comprehensive income (loss) before reclassifications		(5,382)	11,427
Amounts reclassified from accumulated other comprehensive income (loss)		169	245
Net current period other comprehensive income (loss)		(5,213)	11,672	$ 0
Balance		176,470	157,960	158,434
Accumulated Other Comprehensive Income (Loss) [Member]
Changes in Accumulated Other Comprehensive (Loss) Income by Component [Roll Forward]
Balance		(19,625)	(31,297)
Balance		(24,838)	(19,625)	(31,297)
Foreign Currency Translation Adjustment [Member]
Changes in Accumulated Other Comprehensive (Loss) Income by Component [Roll Forward]
Balance		(16,537)	(28,976)
Other comprehensive income (loss) before reclassifications		(6,098)	12,439
Amounts reclassified from accumulated other comprehensive income (loss)		0	0
Net current period other comprehensive income (loss)		(6,098)	12,439
Balance		(22,635)	(16,537)	(28,976)
Unrealized Holding Gains on Available-for-Sale Securities [Member]
Changes in Accumulated Other Comprehensive (Loss) Income by Component [Roll Forward]
Balance		145	424
Other comprehensive income (loss) before reclassifications		37	(279)
Amounts reclassified from accumulated other comprehensive income (loss)		(170)	0
Net current period other comprehensive income (loss)		(133)	(279)
Balance		12	145	424
Unfunded SERP Liability [Member]
Changes in Accumulated Other Comprehensive (Loss) Income by Component [Roll Forward]
Balance		(3,233)	(2,745)
Other comprehensive income (loss) before reclassifications		679	(733)
Amounts reclassified from accumulated other comprehensive income (loss)	[1]	339	245
Net current period other comprehensive income (loss)		1,018	(488)
Balance		$ (2,215)	$ (3,233)	$ (2,745)
[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.

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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Amount after tax of reclassification adjustments of other comprehensive income (loss) attributable to parent.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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