MARKETABLE SECURITIES (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration	$ 11,264	$ 1,342
Recurring | Level 1
Fair value hierarchy for financial assets and liabilities
Assets	217,946	17,307
Recurring | Level 1 | Corporate debt securities
Fair value hierarchy for financial assets and liabilities
Assets		6,039
Recurring | Level 1 | Money market funds
Fair value hierarchy for financial assets and liabilities
Assets	217,946	11,268
Recurring | Level 2
Fair value hierarchy for financial assets and liabilities
Assets	31,343	48,816
Recurring | Level 2 | Corporate debt securities
Fair value hierarchy for financial assets and liabilities
Assets	16,526	29,556
Recurring | Level 2 | Government agency debt securities
Fair value hierarchy for financial assets and liabilities
Assets	14,817	17,251
Recurring | Level 2 | U.S. Treasury securities
Fair value hierarchy for financial assets and liabilities
Assets		2,009
Recurring | Level 3
Fair value hierarchy for financial assets and liabilities
Unfavorable contract assumed	3,540
Liabilities	14,804	1,342
Recurring | Level 3 | Zipsor
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration	1,638	1,342
Recurring | Level 3 | Lazanda
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration	8,616
Recurring | Level 3 | CAMBIA
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration	1,010
Recurring | Total
Fair value hierarchy for financial assets and liabilities
Assets	249,289	66,123
Unfavorable contract assumed	3,540
Liabilities	14,804	1,342
Recurring | Total | Zipsor
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration	1,638	1,342
Recurring | Total | Lazanda
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration	8,616
Recurring | Total | CAMBIA
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration	1,010
Recurring | Total | Corporate debt securities
Fair value hierarchy for financial assets and liabilities
Assets	16,526	35,595
Recurring | Total | Government agency debt securities
Fair value hierarchy for financial assets and liabilities
Assets	14,817	17,251
Recurring | Total | U.S. Treasury securities
Fair value hierarchy for financial assets and liabilities
Assets		2,009
Recurring | Total | Money market funds
Fair value hierarchy for financial assets and liabilities
Assets	$ 217,946	$ 11,268