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Cash, Cash Equivalents, and Investments (Tables)
 3 Months Ended
Apr. 05, 2015
Cash and Cash Equivalents [Abstract]  
Components of Cash, Cash Equivalents, and Investments
Cash, cash equivalents, and investments consisted of the following (in thousands):
 
April 5, 2015
 
December 31, 2014
Cash
$
34,807

 
$
54,917

Money market instruments
1,240

 
777

Cash and cash equivalents
36,047

 
55,694

Euro liquidity fund
62,045

 
48,235

Corporate bonds
37,413

 
30,889

Treasury bills
31,644

 
—

Sovereign bonds
5,605

 
—

Supranational bonds
1,902

 
1,901

Municipal bonds
1,819

 
1,237

Agency bonds
1,523

 
6,883

Asset-backed securities
392

 
1,311

Short-term investments
142,343

 
90,456

Corporate bonds
204,221

 
216,294

Asset-backed securities
77,448

 
62,556

Treasury bills
64,524

 
90,412

Agency bonds
11,364

 
9,566

Sovereign bonds
6,040

 
13,461

Municipal bonds
4,880

 
6,600

Limited partnership interest
1,956

 
1,956

Long-term investments
370,433

 
400,845

 
$
548,823

 
$
546,995
Summary of Available-for-Sale Investments
The following table summarizes the Company’s available-for-sale investments as of April 5, 2015 (in thousands):
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
Short-term:
 
 
 
 
 
 
 
Euro liquidity fund
$
61,866

 
$
179

 
$
—

 
$
62,045

Corporate bonds
37,356

 
58

 
(1
)
 
37,413

Treasury bills
31,652

 
—

 
(8
)
 
31,644

Sovereign bonds
5,594

 
11

 
—

 
5,605

Supranational bonds
1,900

 
2

 
—

 
1,902

Municipal bonds
1,814

 
5

 
—

 
1,819

Agency bonds
1,521

 
2

 
—

 
1,523

Asset-backed securities
392

 
—

 
—

 
392

Long-term:
 
 
 
 
 
 
 
Corporate bonds
203,712

 
618

 
(109
)
 
204,221

Asset-backed securities
77,417

 
43

 
(12
)
 
77,448

Treasury bills
64,468

 
57

 
(1
)
 
64,524

Agency bonds
11,344

 
20

 
—

 
11,364

Sovereign bonds
6,033

 
7

 
—

 
6,040

Municipal bonds
4,855

 
25

 
—

 
4,880

 
$
509,924

 
$
1,027

 
$
(131
)
 
$
510,820
Gross Unrealized Losses and Fair Values for Available-for-Sale Investments
The following table summarizes the Company’s gross unrealized losses and fair values for available-for-sale investments in an unrealized loss position as of April 5, 2015 (in thousands):
 
Unrealized Loss Position For:
 
 
 
Less than 12 Months
 
12 Months or Greater
 
Total
 
Fair Value
 
Unrealized
Losses
 
Fair Value
 
Unrealized
Losses
 
Fair Value
 
Unrealized
Losses
Corporate bonds
$
48,070

 
$
(109
)
 
$
399

 
$
(1
)
 
$
48,469

 
$
(110
)
Treasury bills
33,143

 
(9
)
 
—

 
—

 
33,143

 
(9
)
Asset-backed securities
16,974

 
(7
)
 
2,597

 
(5
)
 
19,571

 
(12
)
 
$
98,187

 
$
(125
)
 
$
2,996

 
$
(6
)
 
$
101,183

 
$
(131
)
Effective Maturity Dates of Available-for-Sale Investments
The following table presents the effective maturity dates of the Company’s available-for-sale investments as of April 5, 2015 (in thousands):
 
 1
Year or Less
 
1-2
Years
 
2-3
Years
 
3-4
Years
 
4-5
Years
 
5-8 Years
 
Total
Corporate bonds
$
37,413

 
$
101,597

 
$
74,312

 
$
22,542

 
$
5,770

 
$
—

 
$
241,634

Treasury bills
31,644

 
64,524

 
—

 
—

 
—

 
—

 
96,168

Asset-backed securities
392

 
8,564

 
38,917

 
16,673

 
8,982

 
4,312

 
77,840

Euro liquidity fund
62,045

 
—

 
—

 
—

 
—

 
—

 
62,045

Agency bonds
1,523

 
6,360

 
5,004

 
—

 
—

 
—

 
12,887

Sovereign bonds
5,605

 
6,040

 
—

 
—

 
—

 
—

 
11,645

Municipal bonds
1,819

 
334

 
3,546

 
—

 
—

 
1,000

 
6,699

Supranational bonds
1,902

 
—

 
—

 
—

 
—

 
—

 
1,902

 
$
142,343

 
$
187,419

 
$
121,779

 
$
39,215

 
$
14,752

 
$
5,312

 
$
510,820