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INVESTMENTS (Tables)
 9 Months Ended
Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]  
Investments
The following table summarizes, by major security type, the Company's investments in marketable securities at December 31, 2017 (in thousands):
 
 
Cost
 
Gross 
Unrealized 
Gains
 
Gross 
Unrealized
 Losses
 
Fair
 Value
Short-term investments in marketable securities:
 
 
 
 
 
 
 
 
Debt securities:
 
 
 
 
 
 
 
 
International government securities
 
$
725,566

 
$
246

 
$
(436
)
 
$
725,376

U.S. government securities
 
996,112

 
5

 
(1,999
)
 
994,118

Corporate debt securities
 
3,067,703

 
449

 
(4,837
)
 
3,063,315

U.S. government agency securities
 
4,444

 
—

 
(30
)
 
4,414

Commercial paper
 
72,650

 
—

 
—

 
72,650

Total
 
$
4,866,475

 
$
700

 
$
(7,302
)
 
$
4,859,873

 
 
 
 
 
 
 
 
 
Long-term investments in marketable securities:
 
 
 
 
 
 
 
 
Debt securities:
 
 
 
 
 
 
 
 
International government securities
 
$
607,000

 
$
1,588

 
$
(678
)
 
$
607,910

U.S. government securities
 
844,910

 
2

 
(10,636
)
 
834,276

Corporate debt securities
 
6,689,747

 
8,399

 
(41,722
)
 
6,656,424

U.S. government agency securities
 
500

 
—

 
(6
)
 
494

Investments in Ctrip:
 
 
 
 
 
 
 
 
Convertible debt securities
 
1,275,000

 
103,100

 
(9,600
)
 
1,368,500

Equity securities
 
655,311

 
299,697

 
(1,012
)
 
953,996

Total
 
$
10,072,468

 
$
412,786

 
$
(63,654
)
 
$
10,421,600

The following table summarizes, by major security type, the Company's investments in marketable securities at September 30, 2018 (in thousands): 
 
 
Cost
 
Gross
Unrealized Gains
 
Gross
Unrealized Losses
 
Fair
 Value
Short-term investments in marketable securities:
 
 
 
 
 
 
 
 
Debt securities:
 
 
 
 
 
 
 
 
International government securities
 
$
389,789

 
$
6

 
$
(523
)
 
$
389,272

U.S. government securities
 
809,241

 
—

 
(3,856
)
 
805,385

Corporate debt securities
 
2,952,065

 
426

 
(11,561
)
 
2,940,930

U.S. government agency securities
 
4,916

 
—

 
(7
)
 
4,909

Commercial paper
 
17,080

 
—

 
—

 
17,080

Certificate of deposit
 
500

 
—

 
—

 
500

Total
 
$
4,173,591

 
$
432

 
$
(15,947
)
 
$
4,158,076

 
 
 
 
 
 
 
 
 
Long-term investments in marketable securities:
 
 
 
 
 
 
 
 
Debt securities:
 
 
 
 
 
 
 
 
International government securities
 
$
790,653

 
$
1,205

 
$
(986
)
 
$
790,872

U.S. government securities
 
370,987

 
—

 
(10,053
)
 
360,934

Corporate debt securities
 
4,747,084

 
4,817

 
(59,563
)
 
4,692,338

Investments in Ctrip:
 
 
 
 
 
 
 
 
Convertible debt securities
 
1,275,000

 
21,500

 
(38,668
)
 
1,257,832

Equity securities
 
655,311

 
153,553

 
(4,781
)
 
804,083

Meituan Dianping equity securities
 
450,270

 
257,134

 
—

 
707,404

Total
 
$
8,289,305

 
$
438,209

 
$
(114,051
)
 
$
8,613,463