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Accounts Receivable, Net and Revenue Concentrations - Net Sales to Significant Customers (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue, Major Customer [Line Items]
Net sales	$ 170,303	$ 182,717	$ 162,523	$ 164,698	$ 181,152	$ 175,652	$ 177,580	$ 161,406	$ 680,241	$ 695,790	$ 651,371
Net Sales | Comcast Corporation
Revenue, Major Customer [Line Items]
Net sales									$ 119,809	$ 159,829	$ 149,476
Percent of net sales									17.60%	23.00%	22.90%
Net Sales | AT&T
Revenue, Major Customer [Line Items]
Net sales									$ 0	$ 77,888	$ 74,704
Percent of net sales									0.00%	11.20%	11.50%

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