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Accounts Receivable, Net and Revenue Concentrations - Significant Customers (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Revenue and Accounts Receivable, Major Customer [Line Items]      
Net sales $ 161,406 $ 150,658  
Accounts receivable, net 129,231   $ 124,592
Sales | Comcast Corporation      
Revenue and Accounts Receivable, Major Customer [Line Items]      
Net sales $ 42,247 $ 39,609  
Concentration risk percentage 26.20% 26.30%  
Sales | DIRECTV      
Revenue and Accounts Receivable, Major Customer [Line Items]      
Net sales $ 16,632 $ 16,819  
Concentration risk percentage 10.30% 11.20%  
Trade accounts receivable | Comcast Corporation      
Revenue and Accounts Receivable, Major Customer [Line Items]      
Concentration risk percentage 19.50%   19.00%
Accounts receivable, net $ 25,156   $ 23,716
Trade accounts receivable | DIRECTV      
Revenue and Accounts Receivable, Major Customer [Line Items]      
Concentration risk percentage 11.80%   10.30%
Accounts receivable, net $ 15,299   $ 12,878