VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for doubtful accounts
Movement in valuation and qualifying accounts
Balance at Beginning of Period	$ 6,192	$ 1,890	$ 2,178
Charged to Costs and Expenses	2,679	4,535	4,241
Deductions	(4,744)	(233)	(4,529)
Balance at End of Period	4,127	6,192	1,890
Reserve for sales returns
Movement in valuation and qualifying accounts
Balance at Beginning of Period	4,949	4,966	4,276
Charged to Costs and Expenses	67,283	70,075	70,308
Deductions	(67,385)	(70,092)	(69,618)
Balance at End of Period	4,847	4,949	4,966
Tax valuation allowances
Movement in valuation and qualifying accounts
Balance at Beginning of Period	1,144	2,727	4,176
Charged to Costs and Expenses	1,771	579	0
Deductions	0	(2,162)	(1,449)
Balance at End of Period	$ 2,915	$ 1,144	$ 2,727