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Accounts Receivable, Net and Revenue Concentrations - Net Sales to Significant Customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue, Major Customer [Line Items]
Net sales	$ 184,163	$ 164,698
Net Sales | Comcast Corporation
Revenue, Major Customer [Line Items]
Net sales	$ 29,246	$ 37,975
Percent of net sales	15.90%	23.10%
Net Sales | Dish Network L.L.C.
Revenue, Major Customer [Line Items]
Net sales	$ 19,678	$ 0
Percent of net sales	10.70%	0.00%

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