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Business Combinations (Details Textuals) - USD ($) $ / shares in Units, $ in Thousands | May 12, 2017 | Jun. 30, 2018 | Dec. 31, 2017 | Apr. 04, 2017 | Nov. 09, 2016
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Business Acquisition [Line Items] |  |  |  |  |
Indefinite-lived intangible assets |  |  | $ 4,400 |  |
Goodwill |  | $ 238,330 | $ 237,992 |  |
Exar Corporation [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Acquisition, Effective Date of Acquisition | May 12, 2017 |  |  |  |
Business Acquisition, Name of Acquired Entity | Exar Corporation |  |  |  |
Business Combination, Consideration Transferred | $ 692,727 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents | 235,810 |  |  |  |
Proceeds from Issuance of Debt | 416,800 |  |  |  |
Long-term Debt, Gross | 425,000 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Fair Value Mark Up On Inventory | 24,300 |  |  |  |
Business Combination, Indemnification Assets, Amount as of Acquisition Date | 5,000 |  |  |  | $ 5,000
Goodwill | 160,331 |  |  |  |
Business Combination, Purchase price | $ 692,727 |  |  |  |
G.hn business of Marvell [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Purchase price |  |  |  | $ 21,000 |
Common Stock [Member] | Exar Corporation [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Acquisition, Share Price | $ 13.00 |  |  |  |
Cash [Member] | Exar Corporation [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Consideration Transferred | $ 688,114 |  |  |  |
Cash in lieu of equity [Member] | Exar Corporation [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Consideration Transferred | $ 12,700 |  |  |  |
In Process Research and Development [Member] | Exar Corporation [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Indefinite-lived intangible assets |  | $ 4,400 |  |  |

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