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Accounts Receivable, Net and Revenue Concentrations
 3 Months Ended
Mar. 31, 2017
Receivables [Abstract]  
Accounts Receivable, Net and Revenue Concentrations
Accounts Receivable, Net and Revenue Concentrations
Accounts receivable, net were as follows:
(In thousands)
March 31, 2017
 
December 31, 2016
Trade receivables, gross
$
124,399

 
$
120,965

Allowance for doubtful accounts
(945
)
 
(904
)
Allowance for sales returns
(501
)
 
(539
)
Net trade receivables
122,953

 
119,522

Other
6,278

 
5,070

Accounts receivable, net
$
129,231

 
$
124,592


Allowance for Doubtful Accounts
Changes in the allowance for doubtful accounts were as follows:
(In thousands)
Three Months Ended March 31,
2017
 
2016
Balance at beginning of period
$
904

 
$
822

Additions (reductions) to costs and expenses
23

 
(40
)
(Write-offs)/Foreign exchange effects
18

 
17

Balance at end of period
$
945

 
$
799


Sales Returns
The allowance for sales returns at March 31, 2017 and December 31, 2016 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 $0.4 million on March 31, 2017 and December 31, 2016, respectively. The value of these returned goods was included in our inventory balance at March 31, 2017 and December 31, 2016.
Significant Customers
Net sales to the following customers totaled more than 10% of our net sales:
 
Three Months Ended March 31,
 
2017
 
2016
 
$ (thousands)
 
% of Net Sales
 
$ (thousands)
 
% of Net Sales
Comcast Corporation
$
42,247

 
26.2
%
 
$
39,609

 
26.3
%
DIRECTV
16,632

 
10.3

 
16,819

 
11.2



Trade receivables associated with these significant customers that totaled more than 10% of our accounts receivable, net were as follows:
 
March 31, 2017
 
December 31, 2016
 
$ (thousands)
 
% of Accounts Receivable, Net
 
$ (thousands)
 
% of Accounts Receivable, Net
Comcast Corporation
$
25,156

 
19.5
%
 
$
23,716

 
19.0
%
DIRECTV
15,299

 
11.8

 
12,878

 
10.3