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Investments (Tables)
 9 Months Ended
Oct. 03, 2015
Investments [Abstract]  
Investments in marketable debt securities
Investments in marketable debt securities were comprised of the following (in thousands):
 
October 3, 2015
 
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
Value
Corporate bonds
$
17,612

 
$
4

 
$
(6
)
 
$
17,610

U.S. Agency bonds
4,998

 
13

 
—

 
5,011

Commercial paper
9,993

 
—

 
—

 
9,993

Municipal bonds
9,209

 
2

 
(1
)
 
9,210

 
$
41,812

 
$
19

 
$
(7
)
 
$
41,824

 
January 3, 2015
 
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
Value
Corporate bonds
$
35,409

 
$
2

 
$
(36
)
 
$
35,375

U.S. Treasury securities
32,507

 
12

 
(23
)
 
32,496

U.S. Agency bonds
22,545

 
4

 
(10
)
 
22,539

Commercial paper
12,487

 
—

 
(1
)
 
12,486

Municipal bonds
11,157

 
2

 
(5
)
 
11,154

 
$
114,105

 
$
20

 
$
(75
)
 
$
114,050
Maturities of marketable debt securities
Maturities of marketable debt securities were as follows (in thousands):
 
October 3, 2015
 
January 3, 2015
 
Amortized
Cost
 
Fair
Value
 
Amortized
Cost
 
Fair
Value
Marketable debt securities – current (due in less than one year)
$
33,231

 
$
33,243

 
$
69,607

 
$
69,609

Marketable debt securities – non-current (due in one to two years)
8,581

 
8,581

 
44,498

 
44,441

 
$
41,812

 
$
41,824

 
$
114,105

 
$
114,050