BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 8) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Changes in the allowance for doubtful accounts
Balance at the beginning of the period	$ 977
Balance at the end of the period	1,136	977
Allowance for doubtful accounts as a percentage of accounts receivable	4.00%	4.00%
Advertising Costs
Advertising expense	22,901	18,855	15,265
Allowance for Doubtful Accounts
Changes in the allowance for doubtful accounts
Balance at the beginning of the period	977	780	988
Allowance for doubtful accounts (charged to expenses)	554	482	53
Accounts receivable written off (or subsequent payments)	(436)	(255)	(173)
Foreign currency translation adjustments	41	(30)	(88)
Balance at the end of the period	$ 1,136	$ 977	$ 780