FAIR VALUE MEASUREMENTS (Tables)

6 Months Ended

Jun. 30, 2017

Fair Value Disclosures [Abstract]

Financial instruments carried at fair value

Financial assets and liabilities carried at fair value as of June 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	$	1,864,644	$	—	$	1,864,644
International government securities	—		22,836		22,836
U.S. government securities	—		104,698		104,698
Corporate debt securities	—		2,159		2,159
Commercial paper	—		11,995		11,995
Short-term investments:
International government securities	—		651,078		651,078
U.S. government securities	—		746,132		746,132
Corporate debt securities	—		2,311,274		2,311,274
Commercial paper	—		13,341		13,341
Long-term investments:
International government securities	—		447,964		447,964
U.S. government securities	—		795,116		795,116
Corporate debt securities	—		6,321,014		6,321,014
U.S. government agency securities	—		4,935		4,935
Ctrip convertible debt securities	—		1,529,500		1,529,500
Ctrip equity securities	1,165,130		—		1,165,130
Derivatives:
Currency exchange derivatives	—		493		493
Total assets at fair value	$	3,029,774	$	12,962,535	$	15,992,309

	Level 1		Level 2		Total
LIABILITIES:
Currency exchange derivatives	$	—	$	188	$	188

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