XML 43 R29.htm IDEA: XBRL DOCUMENT v3.8.0.1
INVESTMENTS (Tables)
 3 Months Ended
Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]  
Investments
The following table summarizes, by major security type, the Company's investments as of March 31, 2018 (in thousands): 
 
 
Cost
 
Gross
Unrealized Gains
 
Gross
Unrealized Losses
 
Fair
 Value
Short-term investments:
 
 
 
 
 
 
 
 
Debt securities:
 
 
 
 
 
 
 
 
International government securities
 
$
461,389

 
$
56

 
$
(555
)
 
$
460,890

U.S. government securities
 
794,489

 
—

 
(4,064
)
 
790,425

Corporate debt securities
 
2,952,709

 
256

 
(14,565
)
 
2,938,400

U.S government agency securities
 
4,435

 
—

 
(27
)
 
4,408

Commercial paper
 
46,581

 
—

 
—

 
46,581

Total short-term investments
 
$
4,259,603

 
$
312

 
$
(19,211
)
 
$
4,240,704

 
 
 
 
 
 
 
 
 
Long-term investments:
 
 
 
 
 
 
 
 
Debt securities:
 
 
 
 
 
 
 
 
International government securities
 
$
786,958

 
$
1,760

 
$
(584
)
 
$
788,134

U.S. government securities
 
555,413

 
—

 
(11,525
)
 
543,888

Corporate debt securities
 
5,744,951

 
7,272

 
(71,499
)
 
5,680,724

U.S. government agency securities
 
500

 
—

 
(6
)
 
494

Ctrip convertible debt securities
 
1,275,000

 
136,013

 
—

 
1,411,013

Equity securities:
 
 
 
 
 
 
 
 
Ctrip equity securities
 
655,311

 
353,199

 
—

 
1,008,510

Total long-term investments
 
$
9,018,133

 
$
498,244

 
$
(83,614
)
 
$
9,432,763

The following table summarizes, by major security type, the Company's investments as of December 31, 2017 (in thousands):
 
 
Cost
 
Gross 
Unrealized 
Gains
 
Gross 
Unrealized
 Losses
 
Fair
 Value
Short-term investments:
 
 
 
 
 
 
 
 
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 short-term investments
 
$
4,866,475

 
$
700

 
$
(7,302
)
 
$
4,859,873

 
 
 
 
 
 
 
 
 
Long-term investments:
 
 
 
 
 
 
 
 
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

Ctrip convertible debt securities
 
1,275,000

 
103,100

 
(9,600
)
 
1,368,500

Equity securities:
 
 
 
 
 
 
 
 
Ctrip equity securities
 
655,311

 
299,697

 
(1,012
)
 
953,996

Total long-term investments
 
$
10,072,468

 
$
412,786

 
$
(63,654
)
 
$
10,421,600