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Accounts Receivable, Net and Revenue Concentrations - Net Sales to Significant Customers (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Revenue, Major Customer [Line Items] |  |  |  |
Net sales | $ 200,724 | $ 182,717 | $ 578,783 | $ 509,938
Net Sales | Comcast Corporation |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Net sales | $ 30,419 | $ 32,336 | $ 91,058 | $ 99,853
Percent of net sales | 15.20% | 17.70% | 15.70% | 19.60%
Net Sales | Ring L.L.C. |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Net sales | $ 21,050 | $ 0 |  |
Percent of net sales | 10.50% | 0.00% |  |

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