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Accounts Receivable, Net and Revenue Concentrations
 9 Months Ended
Sep. 30, 2018
Receivables [Abstract]  
Accounts Receivable, Net and Revenue Concentrations
Accounts Receivable, Net and Revenue Concentrations
Accounts receivable, net were as follows:
(In thousands)
September 30, 2018
 
December 31, 2017
Trade receivables, gross
$
145,823

 
$
142,299

Allowance for doubtful accounts
(992
)
 
(1,064
)
Allowance for sales returns
(588
)
 
(562
)
Net trade receivables
144,243

 
140,673

Other
7,642

 
10,905

Accounts receivable, net
$
151,885

 
$
151,578


Allowance for Doubtful Accounts
Changes in the allowance for doubtful accounts were as follows:
(In thousands)
Nine Months Ended September 30,
2018
 
2017
Balance at beginning of period
$
1,064

 
$
904

Additions to costs and expenses
2

 
167

(Write-offs)/Foreign exchange effects
(74
)
 
(19
)
Balance at end of period
$
992

 
$
1,052



Significant Customers
Net sales to the following customers totaled more than 10% of our net sales:
 
Three Months Ended September 30,
 
2018
 
2017
 
$ (thousands)
 
% of Net Sales
 
$ (thousands)
 
% of Net Sales
Comcast Corporation
$
32,336

 
17.7
%
 
$
36,811

 
21.0
%
AT&T (1)
$
—

 
—
%
 
$
20,117

 
11.5
%

 
Nine Months Ended September 30,
 
2018
 
2017
 
$ (thousands)
 
% of Net Sales
 
$ (thousands)
 
% of Net Sales
Comcast Corporation
$
99,853

 
19.6
%
 
$
122,009

 
23.7
%
AT&T (1)
$
—

 
—
%
 
$
61,057

 
11.9
%
(1)  
Sales associated with this customer did not total more than 10% of our net sales for the indicated period.

Trade receivables associated with these significant customers that totaled more than 10% of our accounts receivable, net were as follows:
 
September 30, 2018
 
December 31, 2017
 
$ (thousands)
 
% of Accounts Receivable, Net
 
$ (thousands)
 
% of Accounts Receivable, Net
Comcast Corporation
$
20,084

 
13.2
%
 
$
25,142

 
16.6
%