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

 
 

 
 

 
 

Short-term investments:
 
 
 
 
 
 
 
 
Foreign government securities
 
$
141,303

 
$
3

 
$
(40
)
 
$
141,266

U.S. government securities
 
655,798

 
21

 
(75
)
 
655,744

Corporate debt securities
 
546,066

 
62

 
(318
)
 
545,810

Commercial paper
 
32,198

 
—

 
—

 
32,198

U.S. government agency securities
 
4,624

 
—

 
(1
)
 
4,623

Total short-term investments
 
$
1,379,989

 
$
86

 
$
(434
)
 
$
1,379,641

 
 
 
 
 
 
 
 
 
Long-term investments:
 
 
 
 
 
 
 
 
Foreign government securities
 
$
311,247

 
$
119

 
$
(112
)
 
$
311,254

U.S. government securities
 
697,558

 
4,001

 
(42
)
 
701,517

Corporate debt securities
 
3,031,365

 
12,635

 
(1,333
)
 
3,042,667

U.S. government agency securities
 
2,542

 
4

 
—

 
2,546

U.S. municipal securities
 
1,106

 
1

 
—

 
1,107

Ctrip corporate debt securities
 
500,000

 
—

 
(17,488
)
 
482,512

Ctrip equity securities
 
421,930

 
10,111

 
—

 
432,041

Total long-term investments
 
$
4,965,748

 
$
26,871

 
$
(18,975
)
 
$
4,973,644

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 corporate 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