ACCRUED EXPENSES (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
ACCRUED EXPENSES
Payroll and related expenses	$ 8,917	$ 15,048
Royalty expenses	9,368	10,949
Research and development expenses	4,884	2,972
Sales and marketing expenses	12,306	8,017
Rebates, discounts and returns accrual	39,003	38,066
Accrued interest	875	0
Other	8,051	5,688
Total accrued expenses	$ 83,404	$ 80,740