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Accounts Receivable, Net and Revenue Concentrations - Revenue and Trade Receivables by Significant Customer (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 181,152 | $ 175,652 | $ 177,580 | $ 161,406 | $ 160,542 | $ 169,185 | $ 170,986 | $ 150,658 | $ 695,790 | $ 651,371 | $ 602,833
Accounts receivable, net | 151,578 |  |  |  | 124,592 |  |  |  | 151,578 | 124,592 |
Revenue, Net | Comcast Corporation |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 159,829 | $ 149,476 | $ 129,475
Concentration risk percentage |  |  |  |  |  |  |  |  | 23.00% | 22.90% | 21.50%
Revenue, Net | AT&T |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 77,888 | $ 74,704 | $ 80,820
Concentration risk percentage |  |  |  |  |  |  |  |  | 11.20% | 11.50% | 13.40%
Trade Accounts Receivable | Comcast Corporation |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  |  |  |  |  | 16.60% | 19.00% |
Accounts receivable, net | 25,142 |  |  |  | 23,716 |  |  |  | $ 25,142 | $ 23,716 |
Trade Accounts Receivable | AT&T |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  |  |  |  |  | 0.00% | 11.30% |
Accounts receivable, net | $ 0 |  |  |  | $ 14,108 |  |  |  | $ 0 | $ 14,108 |

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