SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Allowance for Sales Returns and Exchanges (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for sales returns and exchanges	$ 8,583	$ 9,510	$ 12,519	$ 19,460
Additions to the allowance	8,468	9,260	9,243
Deductions against the allowance	(9,395)	(12,269)	(16,184)
Deferred revenue reduction [Member]
Allowance for sales returns and exchanges	$ 3,200	$ 3,700	$ 6,100