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Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available-for-sale Securities by Significant Investment Category
The following tables summarize our cash and available-for-sale securities by significant investment category.
    
 
 
December 31, 2014
(In thousands)
 
Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
 
Cash and Cash Equivalents
 
Short-Term Marketable Securities
 
Long-Term Marketable Securities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash
 
$
57,505

 
$
—

 
$
—

 
$
57,505

 
$
57,505

 
$
—

 
$
—

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Available for sale:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Level 1:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Money market funds
 
2,366,799

 
—

 
—

 
2,366,799

 
2,366,799

 
—

 
—

U.S. treasury securities
 
1,338,162

 
12,721

 
(2,302
)
 
1,348,581

 
500

 
38,938

 
1,309,143

Subtotal
 
3,704,961

 
12,721

 
(2,302
)
 
3,715,380

 
2,367,299

 
38,938

 
1,309,143

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Level 2:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. agency securities
 
21,186

 
12

 
(7
)
 
21,191

 
—

 
11,748

 
9,443

Non-U.S. government securities
 
31,281

 
2

 
(17
)
 
31,266

 
—

 
19,459

 
11,807

Municipal bonds
 
2,000

 
2

 
—

 
2,002

 
—

 
1,001

 
1,001

Corporate debt securities
 
693,638

 
362

 
(1,115
)
 
692,885

 
1,563

 
80,373

 
610,949

Subtotal
 
748,105

 
378

 
(1,139
)
 
747,344

 
1,563

 
112,581

 
633,200

Total
 
$
4,510,571

 
$
13,099

 
$
(3,441
)
 
$
4,520,229

 
$
2,426,367

 
$
151,519

 
$
1,942,343

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 


 
 
December 31, 2013
(In thousands)
 
Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
 
Cash and Cash Equivalents
 
Short-Term Marketable Securities
 
Long-Term Marketable Securities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash
 
$
71,880

 
$
—

 
$
—

 
$
71,880

 
$
71,880

 
$
—

 
$
—

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Available for sale:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Level 1:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Money market funds
 
2,763,094

 
—

 
—

 
2,763,094

 
2,763,094

 
—

 
—

U.S. treasury securities
 
1,604,450

 
15

 
(28,298
)
 
1,576,167

 
34,184

 
39,262

 
1,502,721

Subtotal
 
4,367,544

 
15

 
(28,298
)
 
4,339,261

 
2,797,278

 
39,262


1,502,721

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Level 2:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. agency securities
 
53,755

 
33

 
(18
)
 
53,770

 
—

 
26,999

 
26,771

Non-U.S. government securities
 
18,352

 
5

 
—

 
18,357

 
—

 
9,306

 
9,051

Municipal bonds
 
2,603

 
—

 
(7
)
 
2,596

 
—

 
603

 
1,993

Corporate debt securities
 
219,491

 
425

 
(69
)
 
219,847

 
—

 
65,317

 
154,530

Subtotal
 
294,201

 
463

 
(94
)
 
294,570

 
—

 
102,225

 
192,345

Total
 
$
4,733,625

 
$
478

 
$
(28,392
)
 
$
4,705,711

 
$
2,869,158

 
$
141,487

 
$
1,695,066

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Schedule of Investments Classified by Contractual Maturity Date
The adjusted cost and estimated fair value of marketable debt securities (corporate debt securities, municipal bonds, U.S. and foreign government securities, and U.S. treasury securities) as of December 31, 2014, by contractual maturity, are shown below. Actual maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations without call or prepayment penalties.

 
 
December 31, 2014
(In thousands)
 
Adjusted Cost
 
Estimated Fair Value
Due in one year or less
 
$
153,537

 
$
153,582

Due after one year through five years
 
1,532,507

 
1,529,504

Due between six and ten years
 
400,223

 
412,839

 
 
$
2,086,267

 
$
2,095,925