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INVESTMENTS (Tables)
 9 Months Ended
Sep. 30, 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 September 30, 2017 (in thousands): 
 
 
Cost
 
Gross
Unrealized Gains
 
Gross
Unrealized Losses
 
Fair
 Value
Short-term investments:
 
 
 
 
 
 
 
 
International government securities
 
$
690,728

 
$
684

 
$
(270
)
 
$
691,142

U.S. government securities
 
844,214

 
42

 
(596
)
 
843,660

Corporate debt securities
 
2,818,705

 
1,052

 
(1,529
)
 
2,818,228

Commercial paper
 
53,998

 
—

 
—

 
53,998

Total short-term investments
 
$
4,407,645

 
$
1,778

 
$
(2,395
)
 
$
4,407,028

 
 
 
 
 
 
 
 
 
Long-term investments:
 
 
 
 
 
 
 
 
International government securities
 
$
591,294

 
$
2,451

 
$
(237
)
 
$
593,508

U.S. government securities
 
1,010,179

 
102

 
(6,495
)
 
1,003,786

Corporate debt securities
 
6,864,642

 
16,184

 
(22,272
)
 
6,858,554

U.S. government agency securities
 
4,953

 
—

 
(26
)
 
4,927

Ctrip convertible debt securities
 
1,275,000

 
237,638

 
—

 
1,512,638

Ctrip equity securities
 
655,311

 
485,590

 
—

 
1,140,901

Total long-term investments
 
$
10,401,379

 
$
741,965

 
$
(29,030
)
 
$
11,114,314