VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period		$ 6,952	$ 8,530	$ 8,713
Charge to expense		1,388	23	744
Other	[1]	(421)	(1,601)	(927)
Balance at end of the period		7,919	6,952	8,530
Allowance for Sales Returns [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period		13,714	14,024	17,265
Charge to expense		8,909	10,851	10,640
Other	[1]	(11,253)	(11,161)	(13,881)
Balance at end of the period		11,370	13,714	14,024
Valuation Allowance Deferred Tax Assets [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period		22,821	24,439	21,860
Charge to expense		(3,552)	(88)	75
Other	[1]	(3,212)	(1,530)	2,504
Balance at end of the period		$ 16,057	$ 22,821	$ 24,439

[1] Amounts sold, written off, or recovered, and the effect of changes in currency translation rates, are included in Column D.