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Summary of Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2017
Accounting Policies [Abstract] |
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] | As of September 30, 2017, the Company had reserves for product returns of $28.4 million, discounts and promotions of $20.0 million and price protection of $3.2 million. As of December 31, 2016, the Company had reserves for product returns of $27.7 million, discounts and promotions of $21.9 million and price protection of $1.5 million.
Basic and Diluted Net Income Per Share | The following table presents the calculation of both basic and diluted net income per share:
| Three Months Ended |  | Nine Months Ended
| (In thousands, except per share amounts)
| September 30, 2017 |  | October 1, 2016 |  | September 30, 2017 |  | October 1, 2016
Net income | $ | 22,082 |  |  | $ | 19,512 |  |  | $ | 46,343 |  |  | $ | 28,258 |
Basic weighted-average shares outstanding | 27,739 |  |  | 27,237 |  |  | 27,520 |  |  | 27,878 |
Dilutive effect of employee stock options and restricted shares | 1,177 |  |  | 541 |  |  | 1,199 |  |  | 545 |
Diluted weighted-average shares outstanding | 28,916 |  |  | 27,778 |  |  | 28,719 |  |  | 28,423 |
Basic income per share | $ | 0.80 |  |  | $ | 0.72 |  |  | $ | 1.68 |  |  | $ | 1.01 |
Diluted income per share | $ | 0.76 |  |  | $ | 0.70 |  |  | $ | 1.61 |  |  | $ | 0.99 |
Fair Value Assets Measured on Recurring Basis | The Company’s financial assets and liabilities measured at fair value on a recurring basis at September 30, 2017, were as follows:
| Fair Value Measurements as of September 30, 2017
| Level 1 |  | Level 2 (1) |  | Level 3
| (In thousands)
Description |  |  |  |  |
Assets: |  |  |  |  |
Cash and cash equivalents |  |  |  |  |
Money market funds | $ | 10,998 |  |  | $ | — |  |  | $ | — |
Short term investments |  |  |  |  |
Corporate and government bonds | — |  |  | 36,442 |  |  | — |
Other current assets |  |  |  |  |
Derivative instruments (Note 6) | — |  |  | 849 |  |  | — |
Total assets measured at fair value | $ | 10,998 |  |  | $ | 37,291 |  |  | $ | — |
Liabilities: |  |  |  |  |
Accrued expenses |  |  |  |  |
Derivative instruments (Note 6) | $ | — |  |  | $ | 315 |  |  | $ | — |
Total liabilities measured at fair value | $ | — |  |  | $ | 315 |  |  | $ | — |
The Company’s financial assets and liabilities measured at fair value on a recurring basis at December 31, 2016, were as follows:
| Fair Value Measurements as of December 31, 2016
| Level 1 |  | Level 2 (1) |  | Level 3
| (In thousands)
Description |  |  |  |  |
Assets: |  |  |  |  |
Cash and cash equivalents |  |  |  |  |
Money market funds | $ | 156,980 |  |  | $ | — |  |  | $ | — |
Short term investments |  |  |  |  |
Corporate and government bonds | — |  |  | 39,930 |  |  | — |
Other current assets |  |  |  |  |
Derivative instruments (Note 6) | — |  |  | 180 |  |  | — |
Total assets measured at fair value | $ | 156,980 |  |  | $ | 40,110 |  |  | $ | — |
Liabilities: |  |  |  |  |
Accrued expenses |  |  |  |  |
Derivative instruments (Note 6) | $ | — |  |  | $ | 43 |  |  | $ | — |
Total liabilities measured at fair value | $ | — |  |  | $ | 43 |  |  | $ | — |
(1) | Level 2 fair value estimates are based on observable inputs other than quoted prices in active markets for identical assets and liabilities, quoted prices for identical or similar assets or liabilities in inactive markets, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + 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=66048111&loc=d3e19190-110258 + Details
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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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