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Accounts Receivable, Net and Revenue Concentrations | 6 Months Ended
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Jun. 30, 2019
Receivables [Abstract] |
Accounts Receivable, Net and Revenue Concentrations | Accounts Receivable, Net and Revenue Concentrations Accounts receivable, net were as follows:
(In thousands) | June 30, 2019 |  | December 31, 2018
Trade receivables, gross | $ | 150,779 |  |  | $ | 133,774 |
Allowance for doubtful accounts | (1,122 | ) |  | (1,121 | )
Allowance for sales returns | (582 | ) |  | (731 | )
Net trade receivables | 149,075 |  |  | 131,922 |
Other | 5,558 |  |  | 12,767 |
Accounts receivable, net | $ | 154,633 |  |  | $ | 144,689 |
Allowance for Doubtful Accounts Changes in the allowance for doubtful accounts were as follows:
(In thousands) | Six Months Ended June 30,
2019 |  | 2018
Balance at beginning of period | $ | 1,121 |  |  | $ | 1,064 |
Additions to costs and expenses | 5 |  |  | 2 |
(Write-offs)/Foreign exchange effects | (4 | ) |  | (58 | )
Balance at end of period | $ | 1,122 |  |  | $ | 1,008 |
Significant Customers Net sales to the following customers totaled more than 10% of our net sales:
| Three Months Ended June 30, |
| 2019 |  | 2018 |
| $ (thousands) |  | % of Net Sales |  | $ (thousands) |  | % of Net Sales |
Comcast Corporation | $ | 31,393 |  |  | 16.2 | % |  | $ | 29,542 |  |  | 18.2 | % |
| Six Months Ended June 30, |
| 2019 |  | 2018 |
| $ (thousands) |  | % of Net Sales |  | $ (thousands) |  | % of Net Sales |
Comcast Corporation | $ | 60,639 |  |  | 16.0 | % |  | $ | 67,517 |  |  | 20.6 | % |
Dish Network L.L.C. | $ | 38,851 |  |  | 10.3 | % |  | — |  | (1) | — |  | (1)
(1) Net sales to this customer did not total more than 10% of our total net sales in the prior period. Trade receivables associated with these significant customers that totaled more than 10% of our accounts receivable, net were as follows:
| June 30, 2019 |  | December 31, 2018 |
| $ (thousands) |  | % of Accounts Receivable, Net |  | $ (thousands) |  | % of Accounts Receivable, Net |
Dish Network L.L.C. | $ | 16,588 |  |  | 10.7 | % |  | — |  | (1) | — | (1)
(1) Trade receivables associated with this customer did not total more than 10% of our accounts receivable, net at December 31, 2018. Revenue Recognition Pattern The pattern of revenue recognition was as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
(In thousands) | 2019 |  | 2018 |  | 2019 |  | 2018
Goods and services transferred at a point in time | $ | 99,632 |  |  | $ | 83,661 |  |  | $ | 201,776 |  |  | $ | 177,600 |
Goods and services transferred over time | 94,264 |  |  | 78,862 |  |  | 176,283 |  |  | 149,621 |
Net sales | $ | 193,896 |  |  | $ | 162,523 |  |  | $ | 378,059 |  |  | $ | 327,221 |

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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- References No definition available. + Details
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