CASH, CASH EQUIVALENTS AND INVESTMENTS (Tables)

6 Months Ended

Jun. 30, 2013

Cash, Cash Equivalents, and Short-term Investments [Abstract]

Investments

Investments at June 30, 2013 consisted of the following (in thousands):

	Amortized		Unrealized					Aggregate Fair
Investment Classification	Cost		Gains		(Losses)			Market Value
June 30, 2013 –
Certificates of deposit	$	9,117	$	3	$	(12	)	$	9,108
Commercial paper	2,000		—		—			2,000
Corporate bonds	151,255		38		(9		)	151,284
U.S. government bonds	3,074		—		(2		)	3,072
Convertible notes	4,300		—		—			4,300
	$	169,746	$	41	$	(23	)	$	169,764

Investments at December 31, 2012 consisted of the following (in thousands):

	Amortized		Unrealized					Aggregate Fair
Investment Classification	Cost		Gains		(Losses)			Market Value
December 31, 2012 –
Certificates of deposit	$	7,562	$	3	$	(5	)	$	7,560
Commercial paper	2,997		—		—			2,997
Corporate bonds	141,349		9		(25		)	141,333
U.S. government bonds	3,098		—		—			3,098
Convertible notes	4,300		—		—			4,300
	$	159,306	$	12	$	(30	)	$	159,288