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Fair Value of Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2016
Fair Value of Financial Instruments  
Financial assets and liabilities measured at fair value on a recurring basis

 
   Fair Value Measurements
at December 31, 2016 Using		    
  
Description
  Quoted Prices in
Active Markets for
Identical Assets
(Level 1)		   Significant Other
Observable
Inputs
(Level 2)		   Significant
Unobservable
Inputs
(Level 3)		   Total  

Assets:

                          

Cash equivalents:

                          

Money market funds

   $ 69,432   $ —   $ —   $ 69,432  

Certificates of deposit

     —     7,153     —     7,153  

Municipal bonds

     —     3,904     —     3,904  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total cash equivalents

   $ 69,432   $ 11,057   $ —   $ 80,489  

Short-term investments:

    
 		    
 		    
 		    
 		  

Municipal bonds

   $ —   $ 79,702   $ —   $ 79,702  

Corporate bonds

     —     31,036     —     31,036  

Variable-rate demand notes

     —     16,400     —     16,400  

U.S. government bonds

     12,416     —     —     12,416  

Asset-backed securities

     —     8,173     —     8,173  

Commercial paper

     —     5,233     —     5,233  

International government bonds

     —     1,001     —     1,001  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total short-term investments

   $ 12,416   $ 141,545   $ —   $ 153,961  

Long-term investments:

    
 		    
 		    
 		    
 		  

Auction rate securities

   $ —   $ —   $ 5,196   $ 5,196  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total long-term investments

   $ —   $ —   $ 5,196   $ 5,196  

Other assets, net:

    
 		    
 		    
 		    
 		  

Derivative instruments

   $ —   $ 1,808   $ —   $ 1,808  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ —   $ 1,808   $ —   $ 1,808  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 81,848   $ 154,410   $ 5,196   $ 241,454  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

 
   Fair Value Measurements
at January 2, 2016 Using		    
  
Description
  Quoted Prices in
Active Markets for
Identical Assets
(Level 1)		   Significant Other
Observable
Inputs
(Level 2)		   Significant
Unobservable
Inputs
(Level 3)		   Total  

Assets:

                          

Cash equivalents:

                          

Money market funds

   $ 37,721   $ —   $ —   $ 37,721  

Commercial paper

     —     11,272     —     11,272  

Certificates of deposit

     —     2,845     —     2,845  

U.S. government agency

     —     1,599     —     1,599  

Municipal bonds

     —     1,577     —     1,577  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total cash equivalents

   $ 37,721   $ 17,293   $ —   $ 55,014  

Short-term investments:

    
 		    
 		    
 		    
 		  

Municipal bonds

   $ —   $ 93,516   $ —   $ 93,516  

Commercial paper

     —     11,176     —     11,176  

Variable-rate demand notes

     —     8,995     —     8,995  

Certificates of deposit

     —     8,000     —     8,000  

U.S. government agency

     —     3,998     —     3,998  

International government bonds

     —     2,220     —     2,220  

Corporate bonds

     —     996     —     996  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total short-term investments

   $ —   $ 128,901   $ —   $ 128,901  

Long-term investments:

    
 		    
 		    
 		    
 		  

Auction rate securities

   $ —   $ —   $ 7,126   $ 7,126  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total long-term investments

   $ —   $ —   $ 7,126   $ 7,126  

Other assets, net:

    
 		    
 		    
 		    
 		  

Derivative instruments

   $ —   $ 92   $ —   $ 92  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ —   $ 92   $ —   $ 92  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

  
$
37,721		  
$
146,286		  
$
7,126		  
$
191,133		  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Liabilities:

                          

Accrued expenses:

                          

Contingent consideration

   $ —   $ —   $ 4,749   $ 4,749  

Other non-current liabilities:

    
 		    
 		    
 		    
 		  

Contingent consideration

   $ —   $ —   $ 9,324   $ 9,324  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ —   $ —   $ 14,073   $ 14,073  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Summarization of contractual underlying maturities of available-for-sale investments

        The Company's investments typically have original maturities greater than ninety days as of the date of purchase. Investments are reported at fair value, with unrealized gains and losses, net of tax, recorded as a component of accumulated other comprehensive income (loss) in the Consolidated Balance Sheet. The following summarizes the contractual underlying maturities of the Company's available-for-sale investments at December 31, 2016 (in thousands):

 
   Cost   Fair Value  

Due in one year or less

   $ 159,670   $ 159,624  

Due after one year through ten years

     59,628     59,426  

Due after ten years

     21,400     20,596  
​ ​ ​ ​ ​ ​ ​ ​

  $ 240,698   $ 239,646  
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
Schedule of available-for-sale investments in continuous unrealized loss position by length of time

        The available-for-sale investments that were in a continuous unrealized loss position, aggregated by length of time that individual securities have been in a continuous loss position, were as follows (in thousands):

 
   Less Than 12 Months   12 Months or Greater   Total  
As of December 31, 2016
  Fair
Value		   Gross
Unrealized
Losses		   Fair
Value		   Gross
Unrealized
Losses		   Fair
Value		   Gross
Unrealized
Losses		  

Municipal bonds

   $ 69,379   $ (140 ) $ —   $ —   $ 69,379   $ (140 )

Corporate bonds

     18,561     (128 )   —     —     18,561     (128 )

U.S. government bonds

     10,364     (16 )   —     —     10,364     (16 )

Auction rate securities

     —     —     5,196     (804 )   5,196     (804 )

Asset-backed securities

     3,176     (4 )   —     —     3,176     (4 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

  $ 101,480   $ (288 ) $ 5,196   $ (804 ) $ 106,676   $ (1,092 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​


 

 
   Less Than 12 Months   12 Months or Greater   Total  
As of January 2, 2016
  Fair
Value		   Gross
Unrealized
Losses		   Fair
Value		   Gross
Unrealized
Losses		   Fair
Value		   Gross
Unrealized
Losses		  

Municipal bonds

   $ 29,271   $ (30 ) $ 1,198   $ (2 ) $ 30,469   $ (32 )

Auction rate securities

     —     —     7,126     (874 )   7,126     (874 )

International government bonds

     2,220     (7 )   —     —     2,220     (7 )

Corporate bonds

     996     (3 )   —     —     996     (3 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

  $ 32,487   $ (40 ) $ 8,324   $ (876 ) $ 40,811   $ (916 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Summary of quantitative information about level 3 asset fair value measurements

Fair Value at
December 31, 2016
(000s)
  Valuation Technique   Unobservable Input   Weighted
Average
$5,196   Discounted cash flow   Estimated yield   1.09%

 
 
 
 
Expected holding period
 
10 years

 
 
 
 
Estimated discount rate
 
3.89%
Summary of activity in Level 3 financial instruments

        The following summarizes the activity in Level 3 financial instruments for the years ended December 31, 2016 and January 2, 2016 (in thousands):

Assets

 
   Year Ended  
Auction Rate Securities
  December 31,
2016		   January 2,
2016		  

Beginning balance

   $ 7,126   $ 7,419  

Settlements

     (2,000 )   —  

Gain (loss) included in other comprehensive income (loss)

     70     (293 )
​ ​ ​ ​ ​ ​ ​ ​

Ending balance

   $ 5,196   $ 7,126  
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​

Liabilities

 
   Year Ended  
Contingent Consideration (1)
  December 31,
2016		   January 2,
2016		  

Beginning balance

   $ 14,073   $ 18,438  

Settlements (2)

     (11,375 )   (4,464 )

(Gain) loss recognized in earnings (3)

     (2,698 )   99  
​ ​ ​ ​ ​ ​ ​ ​

Balance at December 31, 2016

   $ —   $ 14,073  
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​

Net loss for the period included in earnings attributable to contingent consideration held at the end of the period:

   $ —   $ (99 )
​ ​ ​ ​ ​ ​ ​ ​
(1)
In connection with the acquisition of Energy Micro, the Company recorded contingent consideration based upon the expected achievement of certain milestone goals. Changes to the fair value of contingent consideration due to changes in assumptions used in preparing the valuation model were recorded in selling, general and administrative expenses in the Consolidated Statement of Income.

(2)
On March 11, 2016, the Company entered into an agreement which settled the total amount of contingent consideration related to the Energy Micro acquisition (including all amounts for fiscal 2015 through 2018). See Note 8, Acquisitions, for additional information.

(3)
The gain recognized in earnings was due to the settlement of the Energy Micro contingent consideration. This gain was offset in part by a charge of approximately $2.7 million recorded in fiscal 2016 for a portion of the contingent consideration accounted for as post-combination compensation expense.