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INVESTMENTS (Tables)
 3 Months Ended
Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract]  
Investments
The following table summarizes, by major security type, the Company's investments as of December 31, 2016 (in thousands): 
 
 
Cost
 
Gross 
Unrealized 
Gains
 
Gross 
Unrealized
 Losses
 
Fair
 Value
Short-term investments:
 
 
 
 
 
 
 
 
International government securities
 
$
249,552

 
$
221

 
$
(89
)
 
$
249,684

U.S. government securities
 
456,971

 
57

 
(140
)
 
456,888

Corporate debt securities
 
1,510,119

 
1,119

 
(928
)
 
1,510,310

Commercial paper
 
1,998

 
—

 
—

 
1,998

Total short-term investments
 
$
2,218,640

 
$
1,397

 
$
(1,157
)
 
$
2,218,880

 
 
 
 
 
 
 
 
 
Long-term investments:
 
 
 
 
 
 
 
 
International government securities
 
$
655,857

 
$
4,110

 
$
(623
)
 
$
659,344

U.S. government securities
 
773,718

 
337

 
(7,463
)
 
766,592

Corporate debt securities
 
6,042,271

 
9,973

 
(50,455
)
 
6,001,789

U.S. government agency securities
 
4,979

 
—

 
(27
)
 
4,952

Ctrip convertible debt securities
 
1,275,000

 
65,800

 
(47,712
)
 
1,293,088

Ctrip equity securities
 
655,311

 
213,233

 
(3,242
)
 
865,302

Total long-term investments
 
$
9,407,136

 
$
293,453

 
$
(109,522
)
 
$
9,591,067

The following table summarizes, by major security type, the Company's investments as of March 31, 2017 (in thousands): 
 
 
Cost
 
Gross
Unrealized Gains
 
Gross
Unrealized Losses
 
Fair
 Value
Short-term investments:
 
 
 
 
 
 
 
 
International government securities
 
$
517,398

 
$
1,254

 
$
(187
)
 
$
518,465

U.S. government securities
 
580,630

 
17

 
(427
)
 
580,220

Corporate debt securities
 
1,831,179

 
1,482

 
(1,166
)
 
1,831,495

Commercial paper
 
5,978

 
—

 
—

 
5,978

Total short-term investments
 
$
2,935,185

 
$
2,753

 
$
(1,780
)
 
$
2,936,158

 
 
 
 
 
 
 
 
 
Long-term investments:
 
 
 
 
 
 
 
 
International government securities
 
$
450,445

 
$
1,894

 
$
(788
)
 
$
451,551

U.S. government securities
 
828,777

 
286

 
(6,744
)
 
822,319

Corporate debt securities
 
6,387,523

 
10,334

 
(37,658
)
 
6,360,199

U.S. government agency securities
 
4,971

 
—

 
(25
)
 
4,946

Ctrip convertible debt securities
 
1,275,000

 
171,425

 
(8,050
)
 
1,438,375

Ctrip equity securities
 
655,311

 
407,929

 
—

 
1,063,240

Total long-term investments
 
$
9,602,027

 
$
591,868

 
$
(53,265
)
 
$
10,140,630