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Accounts Receivable, Net and Revenue Concentrations - Significant Customers (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Revenue and Accounts Receivable, Major Customer [Line Items] |  |  |  |  |
Net sales | $ 175,652 | $ 169,185 | $ 514,638 | $ 490,829 |
Accounts receivable, net | 153,355 |  | 153,355 |  | $ 124,592
Sales | Comcast Corporation |  |  |  |  |
Revenue and Accounts Receivable, Major Customer [Line Items] |  |  |  |  |
Net sales | $ 36,811 | $ 35,554 | $ 122,009 | $ 111,529 |
Concentration risk percentage | 21.00% | 21.00% | 23.70% | 22.70% |
Sales | AT&T |  |  |  |  |
Revenue and Accounts Receivable, Major Customer [Line Items] |  |  |  |  |
Net sales | $ 20,117 | $ 21,139 | $ 61,057 | $ 60,709 |
Concentration risk percentage | 11.50% | 12.50% | 11.90% | 12.40% |
Trade accounts receivable | Comcast Corporation |  |  |  |  |
Revenue and Accounts Receivable, Major Customer [Line Items] |  |  |  |  |
Concentration risk percentage |  |  | 17.30% |  | 19.00%
Accounts receivable, net | $ 26,553 |  | $ 26,553 |  | $ 23,716
Trade accounts receivable | AT&T |  |  |  |  |
Revenue and Accounts Receivable, Major Customer [Line Items] |  |  |  |  |
Concentration risk percentage |  |  | 0.00% |  | 11.30%
Accounts receivable, net | $ 0 |  | $ 0 |  | $ 14,108

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