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Financial Instruments (Tables)
 6 Months Ended
Jun. 28, 2013
Financial Instruments [Abstract]  
Schedule of Cash and Available-for-sale Securities by Significant Investment Category
The following tables summarize our cash and available-for-sale securities by significant investment category.
    
 
 
June 28, 2013
(In thousands)
 
Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
 
Cash and Cash Equivalents
 
Short-Term Marketable Securities
 
Long-Term Marketable Securities

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash
 
$
61,859

 
$
—

 
$
—

 
$
61,859

 
$
61,859

 
$
—

 
$
—

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Available-for-sale:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Level 1:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Money market funds
 
2,709,386

 
—

 
—

 
2,709,386

 
2,709,386

 
—

 
—

U.S. treasury securities
 
571,714

 
6

 
(3,376
)
 
568,344

 
17,599

 
36,809

 
513,936

Subtotal
 
3,281,100

 
6

 
(3,376
)
 
3,277,730

 
2,726,985

 
36,809


513,936

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Level 2:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. agency securities
 
83,152

 
26

 
(59
)
 
83,119

 
—

 
41,992

 
41,127

Non-U.S. government securities
 
16,074

 
2

 
(6
)
 
16,070

 
—

 
6,758

 
9,312

Municipal bond
 
1,609

 
—

 
(12
)
 
1,597

 
—

 
608

 
989

Corporate securities
 
202,691

 
254

 
(340
)
 
202,605

 
—

 
78,668

 
123,937

Subtotal
 
303,526

 
282

 
(417
)
 
303,391

 
—

 
128,026

 
175,365

Total
 
$
3,646,485

 
$
288

 
$
(3,793
)
 
$
3,642,980

 
$
2,788,844

 
$
164,835

 
$
689,301

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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 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

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Schedule of Investments Classified by Contractual Maturity Date
The adjusted cost and estimated fair value of marketable debt securities (corporate securities, municipal bonds, U.S. and foreign government securities, and U.S. treasury securities) as of June 28, 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.
 
 
June 28, 2013
(In thousands)
 
Cost
 
Estimated Fair Value
Due in one year or less
 
$
182,408

 
$
182,434

Due after one year through five years
 
692,832

 
689,301

 
 
$
875,240

 
$
871,735