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Accounts Receivable, Net and Revenue Concentrations | 3 Months Ended
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Mar. 31, 2016
Receivables [Abstract] |
Accounts Receivable, Net and Revenue Concentrations | Accounts Receivable, Net and Revenue Concentrations Accounts receivable, net were as follows:
(In thousands) | March 31, 2016 |  | December 31, 2015
Trade receivables, gross | $ | 108,831 |  |  | $ | 119,090 |
Allowance for doubtful accounts | (799 | ) |  | (822 | )
Allowance for sales returns | (424 | ) |  | (507 | )
Net trade receivables | 107,608 |  |  | 117,761 |
Other | 3,384 |  |  | 4,040 |
Accounts receivable, net | $ | 110,992 |  |  | $ | 121,801 |
Allowance for Doubtful Accounts Changes in the allowance for doubtful accounts were as follows:
(In thousands) | Three Months Ended March 31,
2016 |  | 2015
Balance at beginning of period | $ | 822 |  |  | $ | 616 |
Additions (reductions) to costs and expenses | (40 | ) |  | 2 |
(Write-offs)/Foreign exchange effects | 17 |  |  | (18 | )
Balance at end of period | $ | 799 |  |  | $ | 600 |
Sales Returns The allowance for sales returns at March 31, 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 March 31, 2016 and December 31, 2015, respectively. The value of these returned goods was included in our inventory balance at March 31, 2016 and December 31, 2015. Significant Customers Net sales to the following customers totaled more than 10% of our net sales:
| Three Months Ended March 31,
| 2016 |  | 2015
| $ (thousands) |  | % of Net Sales |  | $ (thousands) |  | % of Net Sales
Comcast Corporation | $ | 39,609 |  |  | 26.3 | % |  | $ | 15,577 |  |  | 11.7 | %
DIRECTV | 16,819 |  |  | 11.2 |  |  | 17,365 |  |  | 13.1 |
Trade receivables associated with these significant customers that totaled more than 10% of our accounts receivable, net were as follows:
| March 31, 2016 |  | December 31, 2015 |
| $ (thousands) |  | % of Net Sales |  | $ (thousands) |  | % of Net Sales |
Comcast Corporation | 27,126 |  |  | 24.4 | % |  | 29,404 |  |  | 24.1 | % |
DIRECTV | 12,769 |  |  | 11.5 | % |  | — |  | (1) | — | % | (1)
(1) Trade receivables associated with this customer did not total more than 10% of our accounts receivable, net at December 31, 2015.

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- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5066-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5162-111524 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5074-111524 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 9 + Details
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