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Revenue and Accounts Receivable, Net | 12 Months Ended
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Dec. 31, 2019
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) | 2019 |  | 2018
Goods and services transferred at a point in time | $ | 558,361 |  |  | $ | 577,085 |
Goods and services transferred over time | 195,116 |  |  | 103,156 |
Net sales | $ | 753,477 |  |  | $ | 680,241 |
Our net sales to external customers by geographic area were as follows:
| Year Ended December 31,
(In thousands) | 2019 |  | 2018 |  | 2017
United States | $ | 407,291 |  |  | $ | 315,214 |  |  | $ | 345,838 |
Asia (excluding PRC) | 104,324 |  |  | 124,657 |  |  | 104,668 |
People’s Republic of China | 83,677 |  |  | 91,446 |  |  | 83,036 |
Europe | 94,491 |  |  | 85,228 |  |  | 79,183 |
Latin America | 30,006 |  |  | 30,954 |  |  | 54,113 |
Other | 33,688 |  |  | 32,742 |  |  | 28,952 |
Total net sales | $ | 753,477 |  |  | $ | 680,241 |  |  | $ | 695,790 |
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 customers totaled more than 10% of our net sales:
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
| $ (thousands) |  | % of Net Sales |  | $ (thousands) |  | % of Net Sales |  | $ (thousands) |  | % of Net Sales
Comcast Corporation | $ | 119,561 |  |  | 15.9 | % |  | $ | 119,809 |  |  | 17.6 | % |  | $ | 159,829 |  |  | 23.0 | %
AT&T Inc. | — |  | (1) | — |  | (1) | — |  | (1) | — |  | (1) | 77,888 |  |  | 11.2 |
(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) | 2019 |  | 2018
Trade receivables, gross | $ | 130,888 |  |  | $ | 133,774 |
Allowance for doubtful accounts | (1,492 | ) |  | (1,121 | )
Allowance for sales returns | (623 | ) |  | (731 | )
Net trade receivables | 128,773 |  |  | 131,922 |
Other | 10,425 |  |  | 12,767 |
Accounts receivable, net | $ | 139,198 |  |  | $ | 144,689 |
Allowance for Doubtful Accounts Changes in the allowance for doubtful accounts were as follows:
(In thousands) | Year Ended December 31,
2019 |  | 2018 |  | 2017
Balance at beginning of period | $ | 1,121 |  |  | $ | 1,064 |  |  | $ | 904 |
Additions to costs and expenses | 441 |  |  | 305 |  |  | 166 |
(Write-offs)/Foreign exchange effects | (70 | ) |  | (248 | ) |  | (6 | )
Balance at end of period | $ | 1,492 |  |  | $ | 1,121 |  |  | $ | 1,064 |
Trade receivables associated with these significant customers that totaled more than 10% of our accounts receivable, net were as follows:
| December 31,
| 2019 |  | 2018 |
| $ (thousands) |  | % of Accounts Receivable, Net |  | $ (thousands) |  | % of Accounts Receivable, Net |
Dish Network Corporation | 14,677 |  |  | 10.5 | % |  | — |  | (1) | — | (1)
(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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