FAIR VALUE MEASUREMENTS (Tables)

9 Months Ended

Sep. 30, 2017

Fair Value Disclosures [Abstract]

Financial instruments carried at fair value

Financial assets and liabilities carried at fair value as of September 30, 2017 are classified in the tables below in the categories described below (in thousands): 

	Level 1		Level 2		Total
ASSETS:
Cash equivalents:
Money market funds	$	2,013,334	$	—	$	2,013,334
International government securities	—		21,308		21,308
U.S. government securities	—		27,625		27,625
Corporate debt securities	—		15,397		15,397
Commercial paper	—		77,319		77,319
U.S. government agency securities	—		4,800		4,800
Time deposits	4,532		—		4,532
Short-term investments:
International government securities	—		691,142		691,142
U.S. government securities	—		843,660		843,660
Corporate debt securities	—		2,818,228		2,818,228
Commercial paper	—		53,998		53,998
Long-term investments:
International government securities	—		593,508		593,508
U.S. government securities	—		1,003,786		1,003,786
Corporate debt securities	—		6,858,554		6,858,554
U.S. government agency securities	—		4,927		4,927
Ctrip convertible debt securities	—		1,512,638		1,512,638
Ctrip equity securities	1,140,901		—		1,140,901
Derivatives:
Currency exchange derivatives	—		80		80
Total assets at fair value	$	3,158,767	$	14,526,970	$	17,685,737

	Level 1		Level 2		Total
LIABILITIES:
Currency exchange derivatives	$	—	$	1,693	$	1,693

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