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Revenue and Accounts Receivable, Net - Accounts Receivable, Net (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Accounts Receivable, after Allowance for Credit Loss, Current [Abstract] |  |  |  |
Trade receivables, gross | $ 122,828 | $ 130,888 |  |
Allowance for credit losses | (1,412) | (1,492) | $ (1,121) | $ (1,064)
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 |  |

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