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Accounts Receivable | 12 Months Ended
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Dec. 31, 2018
Accounts Receivable |
Accounts Receivable | Note 3: Accounts Receivable Accounts receivable, net consists of the following:
December 31, |  | 2018 |  |  | 2017 |
(in thousands) |  |  |  |  |  |  |  |
Trade receivables: |  |  |  |  |  |  |  |
Billed |  | $ | 266,660 |  |  | $ | 296,588 |
Unbilled |  |  | 56,408 |  |  |  | 68,494 |
Other receivables |  |  | 5,278 |  |  |  | 17,242 |
Total |  |  | 328,346 |  |  |  | 382,324 |
Less: allowance for doubtful accounts |  |  | (4,813 | ) |  |  | (4,471 | )
Accounts receivable, net |  | $ | 323,533 |  |  | $ | 377,853 |
Trade receivables relate to revenues generated from equipment and services, for which credit is extended based on our evaluation of the customer’s credit worthiness. Unbilled receivables represent revenues earned but not billed to the customer until future dates, usually within one month. Other receivables consists primarily of net amounts receivable from an agent, that operates internationally, as well as amounts due from the favorable resolution of state tax audits and rebates due from suppliers. Changes in the Company’s allowance for doubtful accounts are as follows:
Years Ended December 31, |  | 2018 |  |  | 2017 |
(in thousands) |  |  |  |  |  |  |  |
Beginning balance |  | $ | 4,471 |  |  | $ | 2,553 |
Bad debt expense |  |  | 588 |  |  |  | 1,441 |
Accounts written-off |  |  | (260 | ) |  |  | (105 | )
Recoveries |  |  | 14 |  |  |  | 582 |
Ending balance |  | $ | 4,813 |  |  | $ | 4,471 |

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