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Revenue and Accounts Receivable, Net | 12 Months Ended
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Dec. 31, 2020
Receivables [Abstract] |
Revenue and Accounts Receivable, Net | Revenue and Accounts Receivable, Net Revenue Details The pattern of revenue recognition was as follows:
| Year Ended December 31,
(In thousands) | 2020 |  | 2019 |  | 2018
Goods and services transferred at a point in time | $ | 495,033 |  |  | $ | 558,361 |  |  | $ | 577,085 |
Goods and services transferred over time | 119,647 |  |  | 195,116 |  |  | 103,156 |
Net sales | $ | 614,680 |  |  | $ | 753,477 |  |  | $ | 680,241 |
Our net sales to external customers by geographic area were as follows:
| Year Ended December 31,
(In thousands) | 2020 |  | 2019 |  | 2018
United States | $ | 255,651 |  |  | $ | 407,291 |  |  | $ | 315,214 |
Asia (excluding the PRC) | 117,142 |  |  | 104,324 |  |  | 124,657 |
Europe | 108,185 |  |  | 94,491 |  |  | 85,228 |
People's Republic of China | 88,246 |  |  | 83,677 |  |  | 91,446 |
Latin America | 17,481 |  |  | 30,006 |  |  | 30,954 |
Other | 27,975 |  |  | 33,688 |  |  | 32,742 |
Total net sales | $ | 614,680 |  |  | $ | 753,477 |  |  | $ | 680,241 |
Specific identification of the customer billing location was the basis used for attributing revenues from external customers to geographic areas. Net sales to the following customer totaled more than 10% of our net sales:
| Year Ended December 31, |
| 2020 |  | 2019 |  | 2018 |
| $ (thousands) |  | % of Net Sales |  | $ (thousands) |  | % of Net Sales |  | $ (thousands) |  | % of Net Sales |
Comcast Corporation | $ | 123,574 |  |  | 20.1 | % |  | $ | 119,561 |  |  | 15.9 | % |  | $ | 119,809 |  |  | 17.6 | % |
Accounts Receivable, Net Accounts receivable, net were as follows:
| December 31,
(In thousands) | 2020 |  | 2019
Trade receivables, gross | $ | 122,828 |  |  | $ | 130,888 |
Allowance for credit losses | (1,412) |  |  | (1,492) |
Allowance for sales returns | (761) |  |  | (623) |
Trade receivables. net | 120,655 |  |  | 128,773 |
Other | 8,778 |  |  | 10,425 |
Accounts receivable, net | $ | 129,433 |  |  | $ | 139,198 |
Allowance for Credit Losses Changes in the allowance for credit losses were as follows:
(In thousands) | Year Ended December 31,
2020 |  | 2019 |  | 2018
Balance at beginning of period | $ | 1,492 |  |  | $ | 1,121 |  |  | $ | 1,064 |
Additions to costs and expenses | 332 |  |  | 441 |  |  | 305 |
Cash receipts | (157) |  |  | — |  |  | — |
Write-offs/Foreign exchange effects | (255) |  |  | (70) |  |  | (248) |
Balance at end of period | $ | 1,412 |  |  | $ | 1,492 |  |  | $ | 1,121 |
Trade receivables associated with these significant customers that totaled more than 10% of our accounts receivable, net were as follows:
| December 31, |
| 2020 |  | 2019 |  |
| $ (thousands) |  | % of Accounts Receivable, Net |  | $ (thousands) |  | % of Accounts Receivable, Net |  |
Comcast Corporation | $ | 19,782 |  |  | 15.3 | % |  | $ | — |  | (1) | — | % | (1) |
Dish Network Corporation | $ | — |  | (1) | — | % | (1) | $ | 14,677 |  |  | 10.5 | % |  |
(1) Trade receivables associated with this customer did not total more than 10% of our accounts receivable, net for the indicated period.

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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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