FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

Dec. 31, 2016

Fair Value Disclosures [Abstract]

Financial instruments carried at fair value

Financial assets and liabilities carried at fair value as of December 31, 2016 are classified in the categories described in the tables below (in thousands):

	Level 1		Level 2		Total
ASSETS:
Cash equivalents:
Money market funds	$	977,468	$	—	$	977,468
International government securities	—		30,266		30,266
U.S. government securities	—		176,140		176,140
Corporate debt securities	—		9,273		9,273
Commercial paper	—		1,998		1,998
Time deposits	49,160		—		49,160
Short-term investments:
International government securities	—		249,684		249,684
U.S. government securities	—		456,888		456,888
Corporate debt securities	—		1,510,310		1,510,310
Commercial paper	—		1,998		1,998
Long-term investments:
International government securities	—		659,344		659,344
U.S. government securities	—		766,592		766,592
Corporate debt securities	—		6,001,789		6,001,789
U.S. government agency securities	—		4,952		4,952
Ctrip convertible debt securities	—		1,293,088		1,293,088
Ctrip equity securities	865,302		—		865,302
Derivatives:
Currency exchange derivatives	—		756		756
Total assets at fair value	$	1,891,930	$	11,163,078	$	13,055,008

	Level 1		Level 2		Total
LIABILITIES:
Currency exchange derivatives	$	—	$	1,015	$	1,015

Financial assets and liabilities carried at fair value as of December 31, 2015 are classified in the categories described in the tables below (in thousands):

	Level 1		Level 2		Total
ASSETS:
Cash equivalents:
Money market funds	$	99,117	$	—	$	99,117
International government securities	—		10,659		10,659
U.S. government securities	—		90,441		90,441
Corporate debt securities	—		1,855		1,855
Commercial paper	—		335,663		335,663
Short-term investments:
International government securities	—		395,797		395,797
U.S. government securities	—		456,494		456,494
Corporate debt securities	—		305,260		305,260
Commercial paper	—		11,688		11,688
U.S. government agency securities	—		2,007		2,007
Long-term investments:
International government securities	—		719,631		719,631
U.S. government securities	—		578,450		578,450
Corporate debt securities	—		4,276,614		4,276,614
U.S. municipal securities	—		1,083		1,083
Ctrip convertible debt securities	—		1,378,550		1,378,550
Ctrip equity securities	977,035		—		977,035
Derivatives:
Currency exchange derivatives	—		363		363
Total assets at fair value	$	1,076,152	$	8,564,555	$	9,640,707

	Level 1		Level 2		Total
LIABILITIES:
Currency exchange derivatives	$	—	$	644	$	644