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Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2013
Financial Instruments [Abstract]  
Schedule of Available-for-sale Securities Reconciliation
The following tables summarize our cash and available-for-sale securities by significant investment category.
    
 
 
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 bond
 
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

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 


 
 
December 31, 2012
(In thousands)
 
Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
 
Cash and Cash Equivalents
 
Short-Term Marketable Securities
 
Long-Term Marketable Securities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash
 
$
89,194

 
$
—

 
$
—

 
$
89,194

 
$
89,194

 
$
—

 
$
—

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Available for sale:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Level 1:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Money market funds
 
2,739,904

 
—

 
—

 
2,739,904

 
2,739,904

 
—

 
—

U.S. treasury securities
 
564,713

 
5,231

 
(3
)
 
569,941

 
33,519

 
22,493

 
513,929

Subtotal
 
3,304,617

 
5,231

 
(3
)
 
3,309,845

 
2,773,423

 
22,493

—

513,929

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Level 2:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. agency securities
 
116,802

 
58

 
(1
)
 
116,859

 
11,799

 
53,438

 
51,622

Non-U.S. government securities
 
11,644

 
10

 
(2
)
 
11,652

 
—

 
2,730

 
8,922

Municipal bond
 
1,372

 
1

 
—

 
1,373

 
—

 
752

 
621

Corporate debt securities
 
193,048

 
436

 
(64
)
 
193,420

 
2,211

 
61,545

 
129,664

Subtotal
 
322,866

 
505

 
(67
)
 
323,304

 
14,010

 
118,465

 
190,829

Total
 
$
3,716,677

 
$
5,736

 
$
(70
)
 
$
3,722,343

 
$
2,876,627

 
$
140,958

 
$
704,758

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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, 2013, 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, 2013
(In thousands)
 
Adjusted Cost
 
Estimated Fair Value
Due in one year or less
 
$
175,584

 
$
175,671

Due after one year through five years
 
1,723,067

 
1,695,066

 
 
$
1,898,651

 
$
1,870,737