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Cash, Cash Equivalents, and Investments (Tables)
 6 Months Ended
Jul. 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):
 
July 5, 2015
 
December 31, 2014
Cash
$
55,379

 
$
54,917

Money market instruments
6,312

 
777

Cash and cash equivalents
61,691

 
55,694

Treasury bills
75,431

 
—

Euro liquidity fund
63,163

 
48,235

Corporate bonds
39,071

 
30,889

Asset-backed securities
37,894

 
1,311

Sovereign bonds
6,095

 
—

Municipal bonds
1,810

 
1,237

Agency bonds
—

 
6,883

Supranational bonds
—

 
1,901

Short-term investments
223,464

 
90,456

Corporate bonds
175,912

 
216,294

Asset-backed securities
38,211

 
62,556

Treasury bills
6,505

 
90,412

Municipal bonds
4,874

 
6,600

Agency bonds
4,284

 
9,566

Sovereign bonds
2,010

 
13,461

Limited partnership interest
1,956

 
1,956

Long-term investments
233,752

 
400,845

 
$
518,907

 
$
546,995
Summary of Available-for-Sale Investments
The following table summarizes the Company’s available-for-sale investments as of July 5, 2015 (in thousands):
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
Short-term:
 
 
 
 
 
 
 
Treasury bills
$
75,392

 
$
39

 
$
—

 
$
75,431

Euro liquidity fund
63,032

 
131

 
—

 
63,163

Corporate bonds
39,034

 
48

 
(11
)
 
39,071

Asset-backed securities
37,888

 
17

 
(11
)
 
37,894

Sovereign bonds
6,087

 
8

 
—

 
6,095

Municipal bonds
1,807

 
3

 
—

 
1,810

Long-term:
 
 
 
 
 
 
—

Corporate bonds
175,920

 
274

 
(282
)
 
175,912

Asset-backed securities
38,203

 
17

 
(9
)
 
38,211

Treasury bills
6,506

 
2

 
(3
)
 
6,505

Municipal bonds
4,853

 
21

 
—

 
4,874

Agency bonds
4,279

 
5

 
—

 
4,284

Sovereign bonds
2,010

 
—

 
—

 
2,010

 
$
455,011

 
$
565

 
$
(316
)
 
$
455,260
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 July 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
$
101,856

 
$
(287
)
 
$
1,463

 
$
(6
)
 
$
103,319

 
$
(293
)
Asset-backed securities
20,783

 
(17
)
 
1,926

 
(3
)
 
22,709

 
(20
)
Treasury bills
5,203

 
(3
)
 
—

 
—

 
5,203

 
(3
)
 
$
127,842

 
$
(307
)
 
$
3,389

 
$
(9
)
 
$
131,231

 
$
(316
)
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 July 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
$
39,071

 
$
84,541

 
$
66,216

 
$
19,360

 
$
5,795

 
$
—

 
$
214,983

Treasury bills
75,431

 
5,101

 
1,404

 
—

 
—

 
—

 
81,936

Asset-backed securities
37,894

 
23,627

 
3,752

 
3,401

 
6,847

 
584

 
76,105

Euro liquidity fund
63,163

 
—

 
—

 
—

 
—

 
—

 
63,163

Sovereign bonds
6,095

 
2,010

 
—

 
—

 
—

 
—

 
8,105

Municipal bonds
1,810

 
4,373

 
501

 
—

 
—

 
—

 
6,684

Agency bonds
—

 
980

 
3,304

 
—

 
—

 
—

 
4,284

 
$
223,464

 
$
120,632

 
$
75,177

 
$
22,761

 
$
12,642

 
$
584

 
$
455,260