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Accounts Receivable, Net and Revenue Concentrations (Tables)
3 Months Ended
Mar. 31, 2019
Receivables [Abstract]  
Accounts Receivable, Net and Allowance for Doubtful Accounts
Accounts receivable, net were as follows:
(In thousands)
March 31, 2019
 
December 31, 2018
Trade receivables, gross
$
143,752

 
$
133,774

Allowance for doubtful accounts
(1,120
)
 
(1,121
)
Allowance for sales returns
(547
)
 
(731
)
Net trade receivables
142,085

 
131,922

Other
15,986

 
12,767

Accounts receivable, net
$
158,071

 
$
144,689

Changes in the allowance for doubtful accounts were as follows:
(In thousands)
Three Months Ended March 31,
2019
 
2018
Balance at beginning of period
$
1,121

 
$
1,064

Additions to costs and expenses
3

 
4

(Write-offs)/Foreign exchange effects
(4
)
 
9

Balance at end of period
$
1,120

 
$
1,077

Net Sales to Significant Customers
Net sales to the following customers totaled more than 10% of our net sales:
 
Three Months Ended March 31,
 
 
2019
 
2018
 
 
$ (thousands)
 
% of Net Sales
 
$ (thousands)
 
% of Net Sales
 
Comcast Corporation
$
29,246

 
15.9
%
 
$
37,975

 
23.1
%
 
Dish Network L.L.C.
$
19,678

 
10.7
%
 

(1) 

(1) 

(1) Sales associated with this customer did not total more than 10% of our net sales for the three months ended March 31, 2018.
Trade Receivables Associated with Significant Customers
Trade receivables associated with these significant customers that totaled more than 10% of our accounts receivable, net were as follows:
 
March 31, 2019
 
December 31, 2018
 
 
$ (thousands)
 
% of Accounts Receivable, Net
 
$ (thousands)
 
% of Accounts Receivable, Net
 
Comcast Corporation
$
17,917

 
11.3
%
 

(1) 
(1) 

(1) Trade receivables associated with this customer did not total more than 10% of our accounts receivable, net at December 31, 2018.