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Accounts Receivable | 9 Months Ended
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Sep. 30, 2021
Receivables [Abstract] |
Accounts Receivable | Accounts Receivable The Company estimates expected credit losses using a number of factors, including customer credit ratings, age of receivables, historical credit loss information and current and forecasted economic conditions (including the impact of the COVID-19 pandemic) which could affect the collectability of the reported amounts. All of these factors have been considered in the estimate of expected credit losses. The activity related to the allowance for doubtful accounts for the periods presented was as follows:
|  | Three months ended September 30, |  | Nine months ended September 30,
(in thousands) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Balance at beginning of period |  | $ | 7,334 |  |  | $ | 7,743 |  |  | $ | 7,698 |  |  | $ | 5,338 |
Bad debt expense |  | 626 |  |  | 113 |  |  | 324 |  |  | 2,821 |
Amount of receivables written off |  | (224) |  |  | (61) |  |  | (268) |  |  | (335) |
Foreign currency translation and other |  | (74) |  |  | 139 |  |  | (92) |  |  | 110 |
Balance at end of period |  | $ | 7,662 |  |  | $ | 7,934 |  |  | $ | 7,662 |  |  | $ | 7,934 |

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- Definition The entire disclosure for allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -URI http://asc.fasb.org/topic&trid=2196771 + Details
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- References No definition available. + Details
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