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Cash, Cash Equivalents, and Investments (Tables)
 6 Months Ended
Jul. 01, 2018
Cash and Cash Equivalents [Abstract]  
Components of Cash, Cash Equivalents, and Investments
Cash, cash equivalents, and investments consisted of the following (in thousands):
 
July 1, 2018
 
December 31, 2017
Cash
$
124,147

 
$
97,951

Money market instruments
5,055

 
8,631

Cash and cash equivalents
129,202

 
106,582

Treasury bills
136,377

 
150,371

Corporate bonds
116,347

 
47,395

Asset-backed securities
55,240

 
59,203

Agency bonds
29,247

 
10,608

Municipal bonds
9,154

 
8,805

Sovereign bonds
7,375

 
21,579

Short-term investments
353,740

 
297,961

Corporate bonds
208,454

 
296,014

Asset-backed securities
47,740

 
71,727

Sovereign bonds
8,971

 
13,147

Agency bonds
5,934

 
14,890

Municipal bonds
842

 
4,204

Treasury bills
—

 
23,459

Long-term investments
271,941

 
423,441

 
$
754,883

 
$
827,984
Summary of Available-for-Sale Investments
The following table summarizes the Company’s available-for-sale investments as of July 1, 2018 (in thousands):
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
Short-term:
 
 
 
 
 
 

Treasury bills
$
136,706

 
$
3

 
$
(332
)
 
136,377

Corporate bonds
116,659

 
59

 
(371
)
 
116,347

Asset-backed securities
55,459

 
—

 
(219
)
 
55,240

Agency bonds
29,248

 
—

 
(1
)
 
29,247

Municipal bonds
9,165

 
—

 
(11
)
 
9,154

Sovereign bonds
7,400

 
1

 
(26
)
 
7,375

Long-term:
 
 
 
 
 
 

Corporate bonds
208,382

 
636

 
(564
)
 
208,454

Asset-backed securities
48,033

 
12

 
(305
)
 
47,740

Sovereign bonds
8,977

 
35

 
(41
)
 
8,971

Agency bonds
5,930

 
4

 
—

 
5,934

Municipal bonds
855

 
—

 
(13
)
 
842

 
$
626,814

 
$
750

 
$
(1,883
)
 
$
625,681
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 1, 2018 (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
$
139,225

 
$
(713
)
 
$
22,908

 
$
(222
)
 
$
162,133

 
$
(935
)
Treasury bills
84,309

 
(149
)
 
48,464

 
(183
)
 
132,773

 
(332
)
Asset-backed securities
90,411

 
(496
)
 
4,462

 
(28
)
 
94,873

 
(524
)
Agency bonds
29,246

 
(1
)
 
—

 
—

 
29,246

 
(1
)
Sovereign bonds
3,562

 
(9
)
 
4,581

 
(58
)
 
8,143

 
(67
)
Municipal bonds
3,692

 
(24
)
 
—

 
—

 
3,692

 
(24
)
 
$
350,445


$
(1,392
)

$
80,415


$
(491
)

$
430,860


$
(1,883
)
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 1, 2018 (in thousands):
 
<1 year
 
1-2 Years
 
2-3 Years
 
3-4 Years
 
4-5 Years
 
5-7 Years
 
Total
Corporate bonds
$
116,347

 
$
96,004

 
$
71,890

 
$
29,491

 
$
7,704

 
$
3,365

 
$
324,801

Treasury bills
136,377

 
—

 
—

 
—

 
—

 
—

 
136,377

Asset-backed securities
55,240

 
31,023

 
2,178

 
4,320

 
5,809

 
4,410

 
102,980

Agency bonds
29,247

 
—

 
—

 
—

 
5,934

 
—

 
35,181

Sovereign bonds
7,375

 
5,963

 
3,008

 
—

 
—

 
—

 
16,346

Municipal bonds
9,154

 
—

 
842

 
—

 
—

 
—

 
9,996

 
$
353,740


$
132,990


$
77,918


$
33,811


$
19,447


$
7,775


$
625,681