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Cash, Cash Equivalents, and Investments (Tables)
 9 Months Ended
Sep. 28, 2014
Cash and Cash Equivalents [Abstract]  
Components of Cash, Cash Equivalents, and Investments
Cash, cash equivalents, and investments consisted of the following (in thousands):
 
September 28, 2014
 
December 31, 2013
Cash
$
37,611

 
$
40,124

Money market instruments
568

 
520

Cash and cash equivalents
38,179

 
40,644

Corporate bonds
45,889

 
109,040

Municipal bonds
1,971

 
9,276

Sovereign bonds
1,709

 
11,448

Asset-backed securities
189

 
53,559

Agency bonds
—

 
1,499

Short-term investments
49,758

 
184,822

Corporate bonds
209,379

 
109,909

Treasury bills
102,674

 
73,666

Asset-backed securities
64,941

 
21,820

Sovereign bonds
17,525

 
16,385

Municipal bonds
7,043

 
5,919

Agency bonds
5,765

 
—

Limited partnership interest
1,956

 
1,956

Long-term investments
409,283

 
229,655

 
$
497,220

 
$
455,121
Summary of Available-for-Sale Investments
The following table summarizes the Company’s available-for-sale investments as of September 28, 2014 (in thousands):
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
Short-term:
 
 
 
 
 
 
 
Corporate bonds
$
45,785

 
$
106

 
$
(2
)
 
$
45,889

Municipal bonds
1,970

 
1

 
—

 
1,971

Sovereign bonds
1,704

 
5

 
—

 
1,709

Asset-backed securities
189

 
—

 
—

 
189

Long-term:
 
 
 
 
 
 
 
Corporate bonds
208,585

 
936

 
(142
)
 
209,379

Treasury bills
102,685

 
18

 
(29
)
 
102,674

Asset-backed securities
64,936

 
42

 
(37
)
 
64,941

Sovereign bonds
17,516

 
21

 
(12
)
 
17,525

Municipal bonds
6,989

 
54

 
—

 
7,043

Agency bonds
5,771

 
—

 
(6
)
 
5,765

 
$
456,130

 
$
1,183

 
$
(228
)
 
$
457,085
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 September 28, 2014 (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
Treasury bills
$
67,615

 
$
(29
)
 
$
—

 
$
—

 
$
67,615

 
$
(29
)
Corporate bonds
59,613

 
(143
)
 
1,709

 
(1
)
 
61,322

 
(144
)
Asset-backed securities
18,415

 
(24
)
 
4,654

 
(13
)
 
23,069

 
(37
)
Agency bonds
5,765

 
(6
)
 
—

 
—

 
5,765

 
(6
)
Sovereign bonds
5,153

 
(12
)
 
—

 
—

 
5,153

 
(12
)
 
$
156,561

 
$
(214
)
 
$
6,363

 
$
(14
)
 
$
162,924

 
$
(228
)
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 September 28, 2014 (in thousands):
 
 1
Year or Less
 
1-2
Years
 
2-3
Years
 
3-4
Years
 
4-5
Years
 
5-8 Years
 
Total
Corporate bonds
$
45,889

 
$
68,817

 
$
102,268

 
$
18,128

 
$
20,166

 
$
—

 
$
255,268

Treasury bills
—

 
90,210

 
12,464

 
—

 
—

 
—

 
102,674

Asset-backed securities
189

 
9,677

 
15,262

 
24,657

 
10,822

 
4,523

 
65,130

Sovereign bonds
1,709

 
12,372

 
5,153

 
—

 
—

 
—

 
19,234

Municipal bonds
1,971

 
2,965

 
3,574

 
504

 
—

 
—

 
9,014

Agency bonds
—

 
1,500

 
4,265

 
—

 
—

 
—

 
5,765

 
$
49,758

 
$
185,541

 
$
142,986

 
$
43,289

 
$
30,988

 
$
4,523

 
$
457,085