FAIR VALUE (Tables)

12 Months Ended

Dec. 31, 2015

Fair Value Disclosures [Abstract]

Summary of fair value hierarchy for the company's financial assets and liabilities measured at fair value on a recurring basis

The following table represents the Company's fair value hierarchy for its financial assets (cash, cash equivalents and investments) measured at fair value on a recurring basis as of December 31, 2015 (in thousands):

	Level 1		Level 2		Level 3		Total
Assets:
Cash	$	405,597	$	—	$	—	$	405,597
Money market funds	5,043		—		—		5,043
Commercial paper	11,178		—		—		11,178
Auction rate securities	—		—		15,507		15,507
Total assets measured at fair value	$	421,818	$	—	$	15,507	$	437,325

5. FAIR VALUE — (CONTINUED)

The following table represents the Company's fair value hierarchy for its financial assets (cash, cash equivalents and investments) measured at fair value on a recurring basis as of December 31, 2014 (in thousands):

	Level 1		Level 2		Level 3		Total
Assets:
Cash	$	160,275	$	—	$	—	$	160,275
Money market funds	310,482		—		—		310,482
Commercial paper	56,255		—		—		56,255
Auction rate securities	—		—		17,151		17,151
Total assets measured at fair value	$	527,012	$	—	$	17,151	$	544,163

Summary of changes in the fair value of the company's level 3 assets

The following table summarizes changes in fair value of the Company’s Level 3 assets from December 31, 2013 to December 31, 2015 (in thousands):

	Auction Rate Securities
Balance at December 31, 2013	$	21,990
Decrease in unrealized loss included in accumulated other comprehensive loss	836
Settlements	(5,675		)
Balance at December 31, 2014	$	17,151
Decrease in unrealized loss included in accumulated other comprehensive loss	256
Settlements	(1,900		)
Balance at December 31, 2015	$	15,507