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INVESTMENTS (Tables)
 6 Months Ended
Jun. 30, 2015
Investments, Debt and Equity Securities [Abstract]  
Investments
The following table summarizes, by major security type, the Company's investments as of December 31, 2014 (in thousands): 
 
 
Cost
 
Gross 
Unrealized 
Gains
 
Gross 
Unrealized
 Losses
 
Fair
 Value
Available-for-sale securities:
 
 

 
 

 
 

 
 

Short-term investments:
 
 
 
 
 
 
 
 
Foreign government securities
 
$
52,524

 
$
—

 
$
(34
)
 
$
52,490

U.S. government securities
 
364,276

 
24

 
(34
)
 
364,266

Corporate debt securities
 
582,160

 
15

 
(652
)
 
581,523

Commercial paper
 
39,092

 
—

 
—

 
39,092

U.S. government agency securities
 
104,829

 
—

 
(18
)
 
104,811

Total short-term investments
 
$
1,142,881

 
$
39

 
$
(738
)
 
$
1,142,182

 
 
 
 
 
 
 
 
 
Long-term investments:
 
 
 
 
 
 
 
 
Foreign government securities
 
$
12,707

 
$
—

 
$
(36
)
 
$
12,671

U.S. government securities
 
557,130

 
80

 
(762
)
 
556,448

Corporate debt securities
 
2,332,030

 
2,299

 
(5,296
)
 
2,329,033

U.S. government agency securities
 
95,108

 
97

 
(111
)
 
95,094

U.S. municipal securities
 
1,114

 
—

 
(12
)
 
1,102

Ctrip convertible debt securities
 
500,000

 
—

 
(74,039
)
 
425,961

Ctrip equity securities
 
421,930

 
—

 
(86,586
)
 
335,344

Total long-term investments
 
$
3,920,019

 
$
2,476

 
$
(166,842
)
 
$
3,755,653

The following table summarizes, by major security type, the Company's investments as of June 30, 2015 (in thousands): 
 
 
Cost
 
Gross 
Unrealized 
Gains
 
Gross 
Unrealized
 Losses
 
Fair
 Value
Available-for-sale securities:
 
 

 
 

 
 

 
 

Short-term investments:
 
 
 
 
 
 
 
 
Foreign government securities
 
$
199,505

 
$
11

 
$
(55
)
 
$
199,461

U.S. government securities
 
587,802

 
75

 
(14
)
 
587,863

Corporate debt securities
 
512,054

 
63

 
(314
)
 
511,803

Total short-term investments
 
$
1,299,361

 
$
149

 
$
(383
)
 
$
1,299,127

 
 
 
 
 
 
 
 
 
Long-term investments:
 
 
 
 
 
 
 
 
Foreign government securities
 
$
428,402

 
$
69

 
$
(960
)
 
$
427,511

U.S. government securities
 
733,461

 
2,108

 
(409
)
 
735,160

Corporate debt securities
 
3,937,924

 
4,295

 
(8,167
)
 
3,934,052

U.S. government agency securities
 
2,015

 
3

 
—

 
2,018

U.S. municipal securities
 
1,097

 
7

 
—

 
1,104

Ctrip convertible debt securities
 
750,000

 
10,399

 
—

 
760,399

Ctrip equity securities
 
421,930

 
113,294

 
—

 
535,224

Total long-term investments
 
$
6,274,829

 
$
130,175

 
$
(9,536
)
 
$
6,395,468