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Cash, Cash Equivalents, and Investments (Tables)
 9 Months Ended
Oct. 02, 2016
Cash and Cash Equivalents [Abstract]  
Components of Cash, Cash Equivalents, and Investments
Cash, cash equivalents, and investments consisted of the following (in thousands):
 
October 2, 2016
 
December 31, 2015
Cash
$
54,791

 
$
45,951

Money market instruments
6,354

 
6,024

Cash and cash equivalents
61,145

 
51,975

Corporate bonds
134,245

 
54,376

Asset-backed securities
64,740

 
61,994

Euro liquidity fund
49,586

 
47,730

Treasury bills
36,728

 
109,360

Sovereign bonds
28,720

 
21,440

Municipal bonds
9,455

 
590

Agency bonds
4,904

 
978

Short-term investments
328,378

 
296,468

Corporate bonds
163,534

 
176,575

Treasury bills
70,579

 
44,437

Asset-backed securities
38,782

 
24,582

Sovereign bonds
24,384

 
13,503

Agency bonds
18,648

 
8,180

Municipal bonds
—

 
4,869

Limited partnership interest (accounted for using cost method)
—

 
942

Long-term investments
315,927

 
273,088

 
$
705,450

 
$
621,531
Summary of Available-for-Sale Investments
The following table summarizes the Company’s available-for-sale investments as of October 2, 2016 (in thousands):
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
Short-term:
 
 
 
 
 
 
 
Corporate bonds
$
134,232

 
$
56

 
$
(43
)
 
$
134,245

Asset-backed securities
64,696

 
49

 
(5
)
 
64,740

Euro liquidity fund
49,256

 
330

 
—

 
49,586

Treasury bills
36,704

 
27

 
(3
)
 
36,728

Sovereign bonds
28,719

 
5

 
(4
)
 
28,720

Municipal bonds
9,443

 
12

 
—

 
9,455

Agency bonds
4,900

 
4

 
—

 
4,904

Long-term:
 
 
 
 
 
 


Corporate bonds
162,826

 
773

 
(65
)
 
163,534

Treasury bills
70,535

 
60

 
(16
)
 
70,579

Asset-backed securities
38,716

 
72

 
(6
)
 
38,782

Sovereign bonds
24,362

 
31

 
(9
)
 
24,384

Agency bonds
18,610

 
38

 
—

 
18,648

 
$
642,999

 
$
1,457

 
$
(151
)
 
$
644,305
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 October 2, 2016 (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
$
55,613

 
$
(50
)
 
$
24,991

 
$
(58
)
 
$
80,604

 
$
(108
)
Treasury bills
44,714

 
(19
)
 
—

 
—

 
44,714

 
(19
)
Asset-backed securities
7,074

 
(2
)
 
13,580

 
(9
)
 
20,654

 
(11
)
Sovereign bonds
16,414

 
(11
)
 
3,398

 
(2
)
 
19,812

 
(13
)
 
$
123,815


$
(82
)

$
41,969


$
(69
)

$
165,784


$
(151
)
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 October 2, 2016 (in thousands):
 
<1 year
 
1-2 Years
 
2-3 Years
 
3-4 Years
 
4-5 Years
 
Total
Corporate bonds
$
134,245

 
$
71,977

 
$
84,825

 
$
2,212

 
$
4,520

 
$
297,779

Asset-backed securities
64,740

 
20,212

 
8,722

 
9,689

 
159

 
103,522

Treasury bills
36,728

 
70,579

 
—

 
—

 
—

 
107,307

Sovereign bonds
28,720

 
19,749

 
4,635

 
—

 
—

 
53,104

Euro liquidity fund
49,586

 
—

 
—

 
—

 
—

 
49,586

Agency bonds
4,904

 
15,930

 
2,718

 
—

 
—

 
23,552

Municipal bonds
9,455

 
—

 
—

 
—

 
—

 
9,455

 
$
328,378


$
198,447


$
100,900


$
11,901


$
4,679


$
644,305