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Accounts Receivable, Net and Revenue Concentrations - Net Sales to Significant Customers (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Revenue, Major Customer [Line Items] |  |
Net sales | $ 164,698 | $ 161,406
Net Sales | Comcast Corporation |  |
Revenue, Major Customer [Line Items] |  |
Net sales | $ 37,975 | $ 42,247
Percent of net sales | 23.10% | 26.20%
Net Sales | AT&T |  |
Revenue, Major Customer [Line Items] |  |
Net sales | $ 0 | $ 19,200
Percent of net sales | 0.00% | 11.90%

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