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INVESTMENTS (Tables)
 6 Months Ended
Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract]  
Investments
The following table summarizes, by major security type, the Company's investments as of June 30, 2017 (in thousands): 
 
 
Cost
 
Gross
Unrealized Gains
 
Gross
Unrealized Losses
 
Fair
 Value
Short-term investments:
 
 
 
 
 
 
 
 
International government securities
 
$
650,576

 
$
920

 
$
(418
)
 
$
651,078

U.S. government securities
 
746,814

 
8

 
(690
)
 
746,132

Corporate debt securities
 
2,311,980

 
1,068

 
(1,774
)
 
2,311,274

Commercial paper
 
13,341

 
—

 
—

 
13,341

Total short-term investments
 
$
3,722,711

 
$
1,996

 
$
(2,882
)
 
$
3,721,825

 
 
 
 
 
 
 
 
 
Long-term investments:
 
 
 
 
 
 
 
 
International government securities
 
$
447,860

 
$
1,096

 
$
(992
)
 
$
447,964

U.S. government securities
 
801,179

 
179

 
(6,242
)
 
795,116

Corporate debt securities
 
6,342,818

 
9,511

 
(31,315
)
 
6,321,014

U.S. government agency securities
 
4,962

 
—

 
(27
)
 
4,935

Ctrip convertible debt securities
 
1,275,000

 
254,500

 
—

 
1,529,500

Ctrip equity securities
 
655,311

 
509,819

 
—

 
1,165,130

Total long-term investments
 
$
9,527,130

 
$
775,105

 
$
(38,576
)
 
$
10,263,659

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