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Accounts Receivable, Net and Revenue Concentrations (Tables) | 3 Months Ended
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Mar. 31, 2018
Receivables [Abstract] |
Accounts Receivable, Net and Allowance for Doubtful Accounts | Changes in the allowance for doubtful accounts were as follows:
(In thousands) | Three Months Ended March 31,
2018 |  | 2017
Balance at beginning of period | $ | 1,064 |  |  | $ | 904 |
Additions to costs and expenses | 4 |  |  | 23 |
(Write-offs)/Foreign exchange effects | 9 |  |  | 18 |
Balance at end of period | $ | 1,077 |  |  | $ | 945 |
Accounts receivable, net were as follows:
(In thousands) | March 31, 2018 |  | December 31, 2017
Trade receivables, gross | $ | 154,181 |  |  | $ | 142,299 |
Allowance for doubtful accounts | (1,077 | ) |  | (1,064 | )
Allowance for sales returns | (539 | ) |  | (562 | )
Net trade receivables | 152,565 |  |  | 140,673 |
Other | 7,490 |  |  | 10,905 |
Accounts receivable, net | $ | 160,055 |  |  | $ | 151,578 |
Net Sales to Significant Customers | Net sales to the following customers totaled more than 10% of our net sales:
| Three Months Ended March 31,
| 2018 |  | 2017
| $ (thousands) |  | % of Net Sales |  | $ (thousands) |  | % of Net Sales
Comcast Corporation | $ | 37,975 |  |  | 23.1 | % |  | $ | 42,247 |  |  | 26.2 | %
AT&T (1) | $ | — |  |  | — | % |  | $ | 19,200 |  |  | 11.9 | %
(1) | Sales associated with this customer did not total more than 10% of our net sales as of 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, 2018 |  | December 31, 2017
| $ (thousands) |  | % of Accounts Receivable, Net |  | $ (thousands) |  | % of Accounts Receivable, Net
Comcast Corporation | $ | 27,372 |  |  | 17.1 | % |  | $ | 25,142 |  |  | 16.6 | %

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- Definition Schedule of Accounts Receivable by Major Customers by Reporting Segments [Table Text Block] + References No definition available. + Details
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- References No definition available. + Details
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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: 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 + Details
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- Definition Tabular disclosure of the extent of the entity's reliance on its major customers, if revenues from transactions with a single external customer amount to 10 percent or more of entity revenues, including the disclosure of that fact, the total amount of revenues from each such customer, and the identity of the reportable segment or segments reporting the revenues. The entity need not disclose the identity of a major customer or the amount of revenues that each segment reports from that customer. For these purposes, a group of companies known to the entity to be under common control is considered a single customer, and the federal government, a state government, a local government such as a county or municipality, or a foreign government is each considered a single customer. + References No definition available. + Details
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