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INVESTMENTS (Tables)
 12 Months Ended
Dec. 31, 2016
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 December 31, 2015 (in thousands):
 
 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
Short-term investments:
 
 
 
 
 
 
 
International government securities
$
395,404

 
$
497

 
$
(104
)
 
$
395,797

U.S. government securities
457,001

 
—

 
(507
)
 
456,494

Corporate debt securities
305,654

 
25

 
(419
)
 
305,260

Commercial paper
11,688

 
—

 
—

 
11,688

U.S. government agency securities
2,009

 
—

 
(2
)
 
2,007

Total short-term investments
$
1,171,756

 
$
522

 
$
(1,032
)
 
$
1,171,246

 
 
 
 
 
 
 
 
Long-term investments:
 
 
 
 
 
 
 
International government securities
$
718,947

 
$
1,367

 
$
(683
)
 
$
719,631

U.S. government securities
580,155

 
277

 
(1,982
)
 
578,450

Corporate debt securities
4,294,282

 
1,273

 
(18,941
)
 
4,276,614

U.S. municipal securities
1,080

 
3

 
—

 
1,083

Ctrip convertible debt securities
1,250,000

 
158,600

 
(30,050
)
 
1,378,550

Ctrip equity securities
630,311

 
346,724

 
—

 
977,035

Total long-term investments
$
7,474,775

 
$
508,244

 
$
(51,656
)
 
$
7,931,363