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Cash, Cash Equivalents, and Investments (Tables)
 3 Months Ended
Apr. 02, 2017
Cash and Cash Equivalents [Abstract]  
Components of Cash, Cash Equivalents, and Investments
Cash, cash equivalents, and investments consisted of the following (in thousands):
 
April 2, 2017
 
December 31, 2016
Cash
$
88,533

 
$
77,307

Money market instruments
3,895

 
2,334

Cash and cash equivalents
92,428

 
79,641

Corporate bonds
128,507

 
141,188

Treasury bills
92,883

 
67,175

Euro liquidity fund
73,868

 
46,499

Asset-backed securities
58,649

 
69,614

Sovereign bonds
12,340

 
7,298

Agency bonds
7,620

 
2,903

Municipal bonds
2,160

 
6,517

Short-term investments
376,027

 
341,194

Corporate bonds
195,128

 
169,952

Treasury bills
53,370

 
92,280

Asset-backed securities
43,047

 
26,946

Sovereign bonds
18,577

 
23,585

Agency bonds
2,728

 
10,339

Municipal bonds
—

 
1,233

Long-term investments
312,850

 
324,335

 
$
781,305

 
$
745,170
Summary of Available-for-Sale Investments
The following table summarizes the Company’s available-for-sale investments as of April 2, 2017 (in thousands):
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
Short-term:
 
 
 
 
 
 
 
Corporate bonds
$
128,444

 
$
81

 
$
(18
)
 
$
128,507

Treasury bills
93,034

 
3

 
(154
)
 
92,883

Euro liquidity fund
73,540

 
328

 
—

 
73,868

Asset-backed securities
58,657

 
15

 
(23
)
 
58,649

Sovereign bonds
12,357

 
3

 
(20
)
 
12,340

Agency bonds
7,600

 
20

 
—

 
7,620

Municipal bonds
2,160

 
—

 
—

 
2,160

Long-term:
 
 
 
 
 
 


Corporate bonds
194,660

 
737

 
(269
)
 
195,128

Treasury bills
53,459

 
3

 
(92
)
 
53,370

Asset-backed securities
42,990

 
72

 
(15
)
 
43,047

Sovereign bonds
18,658

 
2

 
(83
)
 
18,577

Agency bonds
2,710

 
18

 
—

 
2,728

 
$
688,269

 
$
1,282

 
$
(674
)
 
$
688,877
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 April 2, 2017 (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
$
113,462

 
$
(246
)
 
$
—

 
$
—

 
$
113,462

 
$
(246
)
Corporate bonds
90,190

 
(286
)
 
1,049

 
(1
)
 
91,239

 
(287
)
Asset-backed securities
45,185

 
(37
)
 
2,961

 
(1
)
 
48,146

 
(38
)
Sovereign bonds
27,722

 
(103
)
 
—

 
—

 
27,722

 
(103
)
 
$
276,559


$
(672
)

$
4,010


$
(2
)

$
280,569


$
(674
)
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 April 2, 2017 (in thousands):
 
<1 year
 
1-2 Years
 
2-3 Years
 
3-4 Years
 
4-5 Years
 
5-7 Years
 
Total
Corporate bonds
$
128,507

 
$
87,341

 
$
82,646

 
$
3,928

 
$
21,213

 
$
—

 
$
323,635

Treasury bills
92,883

 
53,370

 
—

 
—

 
—

 
—

 
146,253

Asset-backed securities
58,649

 
9,960

 
23,850

 
5,656

 
21

 
3,560

 
101,696

Euro liquidity fund
73,868

 
—

 
—

 
—

 
—

 
—

 
73,868

Sovereign bonds
12,340

 
13,988

 
4,589

 
—

 
—

 
—

 
30,917

Agency bonds
7,620

 
—

 
2,728

 
—

 
—

 
—

 
10,348

Municipal bonds
2,160

 
—

 
—

 
—

 
—

 
—

 
2,160

 
$
376,027


$
164,659


$
113,813


$
9,584


$
21,234


$
3,560


$
688,877