VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Valuation and Qualifying Accounts Disclosure [Line Items]
BEGINNING BALANCE	$ 2,516	$ 2,257	$ 2,384
Add - Additions charged to earnings	4,486	3,366	3,435
Deduct - Charges for purposes for which reserves were established	(4,696)	(2,919)	(3,562)
Deduct - Adjustment to reserve	(100)	(188)
ENDING BALANCE	2,206	2,516	2,257
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
BEGINNING BALANCE	974	1,176	1,227
Add - Additions charged to earnings	621	76	235
Deduct - Charges for purposes for which reserves were established	(624)	(90)	(286)
Deduct - Adjustment to reserve	(100)	(188)
ENDING BALANCE	871	974	1,176
Sales Returns and Allowances [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
BEGINNING BALANCE	1,542	1,081	1,157
Add - Additions charged to earnings	3,865	3,290	3,200
Deduct - Charges for purposes for which reserves were established	(4,072)	(2,829)	(3,276)
Deduct - Adjustment to reserve	0	0
ENDING BALANCE	$ 1,335	$ 1,542	$ 1,081

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

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