FAIR VALUE MEASUREMENTS (Tables)

3 Months Ended

Mar. 31, 2014

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

The following table provides the assets and liabilities carried at fair value measured on a recurring basis as of March 31, 2014 (in thousands):

			Fair Value Measurements, Using
	Total carrying value as of March 31, 2014		Quoted prices in active markets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
Cash equivalents	$	11,801	$	11,801	$	—	$	—
Short-term investments	230,990		230,990		—		—
Long-term investments	3,051		2,751		—		300

The following table provides the assets and liabilities carried at fair value measured on a recurring basis as of December 31, 2013 (in thousands):

			Fair Value Measurements, Using
	Total carrying value as of December 31, 2013		Quoted prices in active markets  (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
Cash equivalents	$	7,600	$	7,600	$	—	$	—
Short-term investments	202,024		202,024		—		—
Long-term investments	7,417		3,117		—		4,300

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

The following table is a reconciliation of the changes in fair value of the Company’s investments in convertible notes for the three months endedMarch 31, 2014, which had been classified in Level 3 in the fair value hierarchy (in thousands):

	Three Months Ended March 31, 2014
Fair value of notes, beginning of period	$	4,300
Repayment of notes	(4,000		)
Fair value of notes, end of period	$	300