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Fair Value of Financial Instruments (Tables) | 12 Months Ended
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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 |
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Total short-term investments |  | $ | 12,416 |  | $ | 141,545 |  | $ | — |  | $ | 153,961 |
Long-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |
Auction rate securities |  | $ | — |  | $ | — |  | $ | 5,196 |  | $ | 5,196 |
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Total long-term investments |  | $ | — |  | $ | — |  | $ | 5,196 |  | $ | 5,196 |
Other assets, net: |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative instruments |  | $ | — |  | $ | 1,808 |  | $ | — |  | $ | 1,808 |
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Total |  | $ | — |  | $ | 1,808 |  | $ | — |  | $ | 1,808 |
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Total |  | $ | 81,848 |  | $ | 154,410 |  | $ | 5,196 |  | $ | 241,454 |
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|  | Fair Value Measurements at January 2, 2016 Using |  |  |
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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 |
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Total short-term investments |  | $ | — |  | $ | 128,901 |  | $ | — |  | $ | 128,901 |
Long-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |
Auction rate securities |  | $ | — |  | $ | — |  | $ | 7,126 |  | $ | 7,126 |
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Total long-term investments |  | $ | — |  | $ | — |  | $ | 7,126 |  | $ | 7,126 |
Other assets, net: |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative instruments |  | $ | — |  | $ | 92 |  | $ | — |  | $ | 92 |
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Total |  | $ | — |  | $ | 92 |  | $ | — |  | $ | 92 |
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Total |  | $ | 37,721 |  | $ | 146,286 |  | $ | 7,126 |  | $ | 191,133 |
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Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued expenses: |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  | $ | — |  | $ | — |  | $ | 4,749 |  | $ | 4,749 |
Other non-current liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  | $ | — |  | $ | — |  | $ | 9,324 |  | $ | 9,324 |
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Total |  | $ | — |  | $ | — |  | $ | 14,073 |  | $ | 14,073 |
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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 |
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|  | $ | 240,698 |  | $ | 239,646 |
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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 | )
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|  | $ | 101,480 |  | $ | (288 | ) | $ | 5,196 |  | $ | (804 | ) | $ | 106,676 |  | $ | (1,092 | )
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|  | Less Than 12 Months |  | 12 Months or Greater |  | Total |
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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 | )
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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 | )
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Ending balance |  | $ | 5,196 |  | $ | 7,126 |
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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 |
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Balance at December 31, 2016 |  | $ | — |  | $ | 14,073 |
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Net loss for the period included in earnings attributable to contingent consideration held at the end of the period: |  | $ | — |  | $ | (99 | )
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(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.

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- Definition Tabular disclosure of the fair value measurement of assets and liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income, and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issuances, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset and liability. + References No definition available. + Details
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- Definition Tabular disclosure of quantitative information about the inputs used in the fair value measurement of assets. This disclosure may include, but is not limited to, the fair value of the asset, valuation technique used to measure fair value, the inputs used to measure fair value, the ranges of the inputs, and the weighted averages of the inputs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258 + Details
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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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