ACCRUED LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
ACCRUED LIABILITIES
Accrued royalty	$ 69,978	$ 72,103
Accrued clinical trials	36,571	29,143
Accrued Medicaid and Medicare rebates	16,530	20,565
Accrued bonus	8,958	13,971
Accrued benefits and incentive compensation	8,917	8,603
Other accrued costs	17,022	19,248
Accrued liabilities	$ 157,976	$ 163,633