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Cash, Cash Equivalents, and Investments (Tables)
 6 Months Ended
Jul. 03, 2016
Cash and Cash Equivalents [Abstract]  
Components of Cash, Cash Equivalents, and Investments
Cash, cash equivalents, and investments consisted of the following (in thousands):
 
July 3, 2016
 
December 31, 2015
Cash
$
47,751

 
$
45,951

Money market instruments
7,178

 
6,024

Cash and cash equivalents
54,929

 
51,975

Corporate bonds
90,700

 
54,376

Asset-backed securities
68,879

 
61,994

Euro liquidity fund
48,941

 
47,730

Treasury bills
42,013

 
109,360

Sovereign bonds
24,022

 
21,440

Agency bonds
13,177

 
978

Municipal bonds
6,861

 
590

Short-term investments
294,593

 
296,468

Corporate bonds
158,222

 
176,575

Treasury bills
68,966

 
44,437

Asset-backed securities
36,306

 
24,582

Sovereign bonds
24,159

 
13,503

Agency bonds
18,604

 
8,180

Municipal bonds
504

 
4,869

Limited partnership interest (accounted for using cost method)
942

 
942

Long-term investments
307,703

 
273,088

 
$
657,225

 
$
621,531
Summary of Available-for-Sale Investments
The following table summarizes the Company’s available-for-sale investments as of July 3, 2016 (in thousands):
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
Short-term:
 
 
 
 
 
 
 
Corporate bonds
$
90,642

 
$
84

 
$
(26
)
 
$
90,700

Asset-backed securities
68,842

 
52

 
(15
)
 
68,879

Euro liquidity fund
48,753

 
188

 
—

 
48,941

Treasury bills
41,995

 
18

 
—

 
42,013

Sovereign bonds
24,015

 
8

 
(1
)
 
24,022

Agency bonds
13,176

 
1

 
—

 
13,177

Municipal bonds
6,845

 
16

 
—

 
6,861

Long-term:
 
 
 
 
 
 


Corporate bonds
157,541

 
920

 
(239
)
 
158,222

Treasury bills
68,756

 
210

 
—

 
68,966

Asset-backed securities
36,252

 
78

 
(24
)
 
36,306

Sovereign bonds
24,076

 
83

 
—

 
24,159

Agency bonds
18,610

 
—

 
(6
)
 
18,604

Municipal bonds
500

 
4

 
—

 
504

 
$
600,003

 
$
1,662

 
$
(311
)
 
$
601,354
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 3, 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
$
32,420

 
$
(65
)
 
$
34,302

 
$
(200
)
 
$
66,722

 
$
(265
)
Asset-backed securities
26,480

 
(18
)
 
10,966

 
(21
)
 
37,446

 
(39
)
Agency bonds
15,802

 
(6
)
 
—

 
—

 
15,802

 
(6
)
Sovereign bonds
8,101

 
(1
)
 
—

 
—

 
8,101

 
(1
)
 
$
82,803


$
(90
)

$
45,268


$
(221
)

$
128,071


$
(311
)
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 3, 2016 (in thousands):
 
<1 year
 
1-2 Years
 
2-3 Years
 
3-4 Years
 
4-5 Years
 
Total
Corporate bonds
$
90,700

 
$
75,069

 
$
77,871

 
$
4,663

 
$
619

 
$
248,922

Treasury bills
42,013

 
68,034

 
932

 
—

 
—

 
110,979

Asset-backed securities
68,879

 
18,867

 
7,134

 
10,067

 
238

 
105,185

Euro liquidity fund
48,941

 
—

 
—

 
—

 
—

 
48,941

Sovereign bonds
24,022

 
20,317

 
3,842

 
—

 
—

 
48,181

Agency bonds
13,177

 
12,897

 
5,707

 
—

 
—

 
31,781

Municipal bonds
6,861

 
504

 
—

 
—

 
—

 
7,365

 
$
294,593


$
195,688


$
95,486


$
14,730


$
857


$
601,354