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Cash and Investments (Tables)
12 Months Ended
Dec. 28, 2018
Investments, Debt and Equity Securities [Abstract]  
Reconciliation of Cash, Cash Equivalents, and Restricted Cash
A reconciliation of Cash, cash equivalents, and restricted cash reported within our Consolidated Balance Sheets to the amount reported within the accompanying Consolidated Statements of Cash Flows was as follows (in thousands):
 
December 31, 2018
 
December 31, 2017
 
December 31, 2016
Cash and cash equivalents
$
314,775

 
$
183,164

 
$
151,686

Restricted cash included in short-term restricted cash and investments

 
504

 

Restricted cash included in long-term restricted cash and investments
1,100

 
4,646

 
4,150

Cash, cash equivalents, and restricted cash as reported within the accompanying Consolidated Statements of Cash Flows
$
315,875

 
$
188,314

 
$
155,836

Reconciliation of Cash, Cash Equivalents, and Restricted Cash
A reconciliation of Cash, cash equivalents, and restricted cash reported within our Consolidated Balance Sheets to the amount reported within the accompanying Consolidated Statements of Cash Flows was as follows (in thousands):
 
December 31, 2018
 
December 31, 2017
 
December 31, 2016
Cash and cash equivalents
$
314,775

 
$
183,164

 
$
151,686

Restricted cash included in short-term restricted cash and investments

 
504

 

Restricted cash included in long-term restricted cash and investments
1,100

 
4,646

 
4,150

Cash, cash equivalents, and restricted cash as reported within the accompanying Consolidated Statements of Cash Flows
$
315,875

 
$
188,314

 
$
155,836

Investments by Security Type
Cash and investments by security type were as follows (in thousands):
 
December 31, 2018
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
Investments available-for-sale:
 
 
 
 
 
 
 
Money market funds
$
47,744

 
$

 
$

 
$
47,744

Commercial paper
381,134

 

 
(1
)
 
381,133

Corporate bonds
344,741

 
180

 
(857
)
 
344,064

U.S. Treasury and government sponsored enterprises
55,224

 
2

 
(25
)
 
55,201

Total investments available-for-sale
828,843

 
182

 
(883
)
 
828,142

Cash and restricted cash
6,883

 

 

 
6,883

Certificates of deposit
16,596

 

 

 
16,596

Total cash and investments
$
852,322

 
$
182

 
$
(883
)
 
$
851,621

 
December 31, 2017
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
Investments available-for-sale:
 
 
 
 
 
 
 
Money market funds
$
45,478

 
$

 
$

 
$
45,478

Commercial paper
199,647

 

 

 
199,647

Corporate bonds
179,336

 
18

 
(332
)
 
179,022

U.S. Treasury and government sponsored enterprises
16,295

 

 
(32
)
 
16,263

Total investments available-for-sale
440,756

 
18

 
(364
)
 
440,410

Cash and restricted cash
3,268

 

 

 
3,268

Certificates of deposit
13,498

 

 

 
13,498

Total cash and investments
$
457,522

 
$
18

 
$
(364
)
 
$
457,176

Fair Value and Gross Unrealized Losses of Investments Available-for-Sale in an Unrealized Loss Position
The fair value of gross unrealized losses on investments available-for-sale in an unrealized loss position were as follows (in thousands):
 
December 31, 2018
 
In an Unrealized Loss Position Less than 12 Months
 
In an Unrealized Loss Position 12 Months or Greater
 
Total
 
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross
Unrealized
Losses
Corporate bonds
$
236,162

 
$
(606
)
 
$
39,627

 
$
(251
)
 
$
275,789

 
$
(857
)
U.S. Treasury and government sponsored enterprises
28,105

 
(16
)
 
9,182

 
(9
)
 
37,287

 
(25
)
Commercial paper
7,091

 
(1
)
 

 

 
7,091

 
(1
)
Total
$
271,358

 
$
(623
)
 
$
48,809

 
$
(260
)
 
$
320,167

 
$
(883
)
 
December 31, 2017
 
In an Unrealized Loss Position Less than 12 Months
 
In an Unrealized Loss Position 12 Months or Greater
 
Total
 
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross
Unrealized
Losses
Corporate bonds
$
140,746

 
$
(296
)
 
$
20,047

 
$
(36
)
 
$
160,793

 
$
(332
)
U.S. Treasury and government sponsored enterprises
13,611

 
(23
)
 
2,651

 
(9
)
 
16,262

 
(32
)
Total
$
154,357

 
$
(319
)
 
$
22,698

 
$
(45
)
 
$
177,055

 
$
(364
)
Fair Value of Cash Equivalents and Investments by Contractual Maturity
The fair value of investments available-for-sale by contractual maturity were as follows (in thousands):
 
December 31,
 
2018
 
2017
Maturing in one year or less
$
674,455

 
$
377,155

Maturing after one year through five years
153,687

 
63,255

Total investments available-for-sale
$
828,142

 
$
440,410