FAIR VALUE MEASUREMENTS (Tables)

3 Months Ended

Mar. 31, 2017

Fair Value Disclosures [Abstract]

Financial instruments carried at fair value

Financial assets and liabilities carried at fair value as of March 31, 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	$	1,249,091	$	—	$	1,249,091
International government securities	—		35,052		35,052
U.S. government securities	—		159,956		159,956
Corporate debt securities	—		10,243		10,243
Time deposits	4,724		—		4,724
Short-term investments:
International government securities	—		518,465		518,465
U.S. government securities	—		580,220		580,220
Corporate debt securities	—		1,831,495		1,831,495
Commercial paper	—		5,978		5,978
Long-term investments:
International government securities	—		451,551		451,551
U.S. government securities	—		822,319		822,319
Corporate debt securities	—		6,360,199		6,360,199
U.S. government agency securities	—		4,946		4,946
Ctrip convertible debt securities	—		1,438,375		1,438,375
Ctrip equity securities	1,063,240		—		1,063,240
Derivatives:
Currency exchange derivatives	—		558		558
Total assets at fair value	$	2,317,055	$	12,219,357	$	14,536,412

	Level 1		Level 2		Total
LIABILITIES:
Currency exchange derivatives	$	—	$	593	$	593

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