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Cash, Cash Equivalents, and Investments (Tables)
 3 Months Ended
Apr. 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):
 
April 3, 2016
 
December 31, 2015
Cash
$
48,603

 
$
45,951

Money market instruments
31,311

 
6,024

Cash and cash equivalents
79,914

 
51,975

Treasury bills
106,602

 
109,360

Corporate bonds
74,627

 
54,376

Asset-backed securities
64,478

 
61,994

Euro liquidity fund
50,094

 
47,730

Sovereign bonds
22,684

 
21,440

Agency bonds
980

 
978

Municipal bonds
324

 
590

Short-term investments
319,789

 
296,468

Corporate bonds
159,221

 
176,575

Treasury bills
42,938

 
44,437

Asset-backed securities
27,115

 
24,582

Agency bonds
8,195

 
8,180

Sovereign bonds
6,805

 
13,503

Municipal bonds
4,544

 
4,869

Limited partnership interest (accounted for using cost method)
942

 
942

Long-term investments
249,760

 
273,088

 
$
649,463

 
$
621,531
Summary of Available-for-Sale Investments
The following table summarizes the Company’s available-for-sale investments as of April 3, 2016 (in thousands):
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
Short-term:
 
 
 
 
 
 
 
Treasury bills
$
106,592

 
$
20

 
$
(10
)
 
$
106,602

Corporate bonds
74,589

 
73

 
(35
)
 
74,627

Asset-backed securities
64,508

 
10

 
(40
)
 
64,478

Euro liquidity fund
49,951

 
143

 
—

 
50,094

Sovereign bonds
22,693

 
1

 
(10
)
 
22,684

Agency bonds
980

 
—

 
—

 
980

Municipal bonds
322

 
2

 
—

 
324

Long-term:
 
 
 
 
 
 


Corporate bonds
159,520

 
392

 
(691
)
 
159,221

Treasury bills
42,868

 
78

 
(8
)
 
42,938

Asset-backed securities
27,150

 
16

 
(51
)
 
27,115

Agency bonds
8,199

 
—

 
(4
)
 
8,195

Sovereign bonds
6,806

 
3

 
(4
)
 
6,805

Municipal bonds
4,525

 
19

 
—

 
4,544

 
$
568,703

 
$
757

 
$
(853
)
 
$
568,607
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 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
$
85,206

 
$
(545
)
 
$
24,501

 
$
(181
)
 
$
109,707

 
$
(726
)
Treasury bills
89,283

 
(18
)
 
—

 
—

 
89,283

 
(18
)
Asset-backed securities
48,642

 
(82
)
 
5,085

 
(9
)
 
53,727

 
(91
)
Sovereign bonds
22,108

 
(14
)
 
—

 
—

 
22,108

 
(14
)
Agency bonds
8,195

 
(4
)
 
—

 
—

 
8,195

 
(4
)
 
$
253,434


$
(663
)

$
29,586


$
(190
)

$
283,020


$
(853
)
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 3, 2016 (in thousands):
 
<1 year
 
1-2 Years
 
2-3 Years
 
3-4 Years
 
4-5 Years
 
5-7 Years
 
Total
Corporate bonds
$
74,627

 
$
77,318

 
$
73,926

 
$
4,563

 
$
3,414

 
$
—

 
$
233,848

Treasury bills
106,602

 
33,935

 
9,003

 
—

 
—

 
—

 
149,540

Asset-backed securities
64,478

 
12,311

 
8,608

 
3,286

 
2,594

 
316

 
91,593

Euro liquidity fund
50,094

 
—

 
—

 
—

 
—

 
—

 
50,094

Sovereign bonds
22,684

 
6,805

 
—

 
—

 
—

 
—

 
29,489

Agency bonds
980

 
8,195

 
—

 
—

 
—

 
—

 
9,175

Municipal bonds
324

 
4,544

 
—

 
—

 
—

 
—

 
4,868

 
$
319,789


$
143,108


$
91,537


$
7,849


$
6,008


$
316


$
568,607