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Acquisitions and Divestitures - Narrative - Divestiture (Details) - USD ($) |  |  |  | 9 Months Ended
--- | --- | --- | --- | ---
Sep. 29, 2016 | Sep. 21, 2016 | Apr. 11, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Proceeds related to recent or pending divestitures |  | $ 50,000,000 |  | $ 0 | $ 11,300,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Purchase consideration for recent or pending divestitures | $ 11,700,000 |  | $ 11,000,000 |  |
Proceeds related to recent or pending divestitures | 11,300,000 |  | 9,000,000 |  |
Liabilities settled | 400,000 |  |  |  |
Receivables | $ 2,100,000 |  |  |  |
Gain recognized during the period |  |  |  | $ 45,000 |
Certain Transition Services |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Receivables |  |  | $ 1,000,000 |  |
Contingent consideration payout period |  |  | 2 years |  |
Satisfaction Of Certain Conditions |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Receivables |  |  | $ 1,000,000 |  |
Purchase Of Module Product Inventory |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Receivables |  |  | 3,800,000 |  |
Purchase Of Module Product Inventory - Certain Transition Services |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Receivables |  |  | $ 1,000,000 |  |
Contingent consideration payout period |  |  | 2 years |  |

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