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Revenue and Accounts Receivable, Net | 12 Months Ended
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Dec. 31, 2021
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) | 2021 |  | 2020 |  | 2019
Goods and services transferred at a point in time | $ | 498,554 |  |  | $ | 495,033 |  |  | $ | 558,361 |
Goods and services transferred over time | 103,048 |  |  | 119,647 |  |  | 195,116 |
Net sales | $ | 601,602 |  |  | $ | 614,680 |  |  | $ | 753,477 |
Our net sales to external customers by geographic area were as follows:
| Year Ended December 31,
(In thousands) | 2021 |  | 2020 |  | 2019
United States | $ | 200,136 |  |  | $ | 255,651 |  |  | $ | 407,291 |
Asia (excluding the PRC) | 127,140 |  |  | 117,142 |  |  | 104,324 |
Europe | 126,551 |  |  | 108,185 |  |  | 94,491 |
People's Republic of China | 87,866 |  |  | 88,246 |  |  | 83,677 |
Latin America | 25,943 |  |  | 17,481 |  |  | 30,006 |
Other | 33,966 |  |  | 27,975 |  |  | 33,688 |
Total net sales | $ | 601,602 |  |  | $ | 614,680 |  |  | $ | 753,477 |
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, |  |
| 2021 |  | 2020 |  | 2019 |  |
| $ (thousands) |  | % of Net Sales |  | $ (thousands) |  | % of Net Sales |  | $ (thousands) |  | % of Net Sales |  |
Comcast Corporation | $ | 98,361 |  |  | 16.3 | % |  | $ | 123,574 |  |  | 20.1 | % |  | $ | 119,561 |  |  | 15.9 | % |  |
Daikin Industries Ltd. | $ | 70,793 |  |  | 11.8 | % |  | $ | — |  | (1) | — | % | (1) | $ | — |  | (1) | — | % | (1) |
(1) Sales associated with this customer did not total more than 10% of our net sales for the indicated period. Accounts Receivable, Net Accounts receivable, net were as follows:
| December 31,
(In thousands) | 2021 |  | 2020
Trade receivables, gross | $ | 122,508 |  |  | $ | 122,828 |
Allowance for credit losses | (1,285) |  |  | (1,412) |
Allowance for sales returns | (592) |  |  | (761) |
Trade receivables, net | 120,631 |  |  | 120,655 |
Other (1) | 8,584 |  |  | 8,778 |
Accounts receivable, net | $ | 129,215 |  |  | $ | 129,433 |
(1) Other accounts receivable is primarily comprised of value added tax and supplier rebate receivables. Allowance for Credit Losses Changes in the allowance for credit losses were as follows:
(In thousands) | Year Ended December 31,
2021 |  | 2020 |  | 2019
Balance at beginning of period | $ | 1,412 |  |  | $ | 1,492 |  |  | $ | 1,121 |
Additions to costs and expenses | — |  |  | 332 |  |  | 441 |
Cash receipts | — |  |  | (157) |  |  | — |
Write-offs/Foreign exchange effects | (127) |  |  | (255) |  |  | (70) |
Balance at end of period | $ | 1,285 |  |  | $ | 1,412 |  |  | $ | 1,492 |
Trade receivables associated with these significant customers that totaled more than 10% of our accounts receivable, net were as follows:
| December 31, |
| 2021 |  | 2020 |  |
| $ (thousands) |  | % of Accounts Receivable, Net |  | $ (thousands) |  | % of Accounts Receivable, Net |  |
Comcast Corporation | $ | — |  | (1) | — | % | (1) | $ | 19,782 |  |  | 15.3 | % |  |
(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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