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Accounts Receivable, Net and Revenue Concentrations
 6 Months Ended
Jun. 30, 2016
Receivables [Abstract]  
Accounts Receivable, Net and Revenue Concentrations
Accounts Receivable, Net and Revenue Concentrations
Accounts receivable, net were as follows:
(In thousands)
June 30, 2016
 
December 31, 2015
Trade receivables, gross
$
129,728

 
$
119,090

Allowance for doubtful accounts
(942
)
 
(822
)
Allowance for sales returns
(428
)
 
(507
)
Net trade receivables
128,358

 
117,761

Other
3,767

 
4,040

Accounts receivable, net
$
132,125

 
$
121,801


Allowance for Doubtful Accounts
Changes in the allowance for doubtful accounts were as follows:
(In thousands)
Six Months Ended June 30,
2016
 
2015
Balance at beginning of period
$
822

 
$
616

Additions (reductions) to costs and expenses
116

 
138

(Write-offs)/Foreign exchange effects
4

 
(68
)
Balance at end of period
$
942

 
$
686


Sales Returns
The allowance for sales returns at June 30, 2016 and December 31, 2015 included reserves for items returned prior to period-end that were not completely processed, and therefore had not yet been removed from the allowance for sales returns balance. If these returns had been fully processed, the allowance for sales returns balance would have been approximately $0.3 million and $0.3 million on June 30, 2016 and December 31, 2015, respectively. The value of these returned goods was included in our inventory balance at June 30, 2016 and December 31, 2015.
Significant Customers
Net sales to the following customers totaled more than 10% of our net sales:
 
Three Months Ended June 30,
 
2016
 
2015
 
$ (thousands)
 
% of Net Sales
 
$ (thousands)
 
% of Net Sales
Comcast Corporation
$
36,366

 
21.3
%
 
$
30,381

 
20.6
%
DIRECTV
20,035

 
11.7

 
18,125

 
12.3



 
Six Months Ended June 30,
 
2016
 
2015
 
$ (thousands)
 
% of Net Sales
 
$ (thousands)
 
% of Net Sales
Comcast Corporation
$
75,975

 
23.6
%
 
$
45,958

 
16.4
%
DIRECTV
36,854

 
11.5

 
35,490

 
12.7



Trade receivables associated with these significant customers that totaled more than 10% of our accounts receivable, net were as follows:
 
June 30, 2016
 
December 31, 2015
 
$ (thousands)
 
% of Accounts Receivable, Net
 
$ (thousands)
 
% of Accounts Receivable, Net
Comcast Corporation
28,777

 
21.8
%
 
29,404

 
24.1
%