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Business Combinations Business Combination - Exar (Details) - USD ($) $ / shares in Units, $ in Thousands | May 12, 2017 | Jun. 30, 2018 | Dec. 31, 2017
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Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 238,330 | $ 237,992
Exar Corporation [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Consideration Transferred | $ 692,727 |  |
Business acquisition, Shares Tendered | 51,953,635 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents | $ 235,810 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables | 11,363 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory | 48,536 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets | 2,288 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment | 3,442 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | 249,500 |  |
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets | 7,955 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets | 5,434 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable | (12,385) |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Accrued Expenses and Other Current Liabilities | (11,264) |  |
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Liabilities, Accrued Compensation | (5,253) |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other | (3,030) |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net | 532,396 |  |
Goodwill | 160,331 |  |
Business Combination, Purchase price | $ 692,727 |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 6 years |  |
Finite-lived Intangible Assets Acquired | $ 232,900 |  |
Business Combination, Finite and Indefinite Lived Intangible Assets Acquired | 249,500 |  |
Exar Corporation [Member] | In Process Research and Development [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Indefinite-lived Intangible Assets Acquired | $ 16,600 |  |
Exar Corporation [Member] | Developed technology |  |  |
Business Acquisition [Line Items] |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 7 years |  |
Finite-lived Intangible Assets Acquired | $ 120,900 |  |
Exar Corporation [Member] | Trademarks and Trade Names [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 6 years |  |
Finite-lived Intangible Assets Acquired | $ 12,100 |  |
Exar Corporation [Member] | Customer Relationships [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 5 years |  |
Finite-lived Intangible Assets Acquired | $ 96,300 |  |
Exar Corporation [Member] | Order or Production Backlog [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 6 months |  |
Finite-lived Intangible Assets Acquired | $ 3,600 |  |
Exar Corporation [Member] | Cash [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Acquisition, Tender Amount | 675,400 |  |
Exar Corporation [Member] | Cash [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 |  |
Stock Based Awards [Member] | Exar Corporation [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned | $ 4,613 |  |
Common Stock [Member] | Exar Corporation [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Acquisition, Share Price | $ 13.00 |  |

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