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Accounts Receivable | 12 Months Ended
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Dec. 31, 2019
Accounts Receivable |
Accounts Receivable | Note 4: Accounts Receivable Accounts receivable, net consists of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, |  | 2019 |  | 2018
(in thousands) | ​ |  | ​ | ​ |  | ​
Trade receivables: |  | ​ |  |  | ​ |
Billed | ​ | $ | 191,579 | ​ | $ | 266,660
Unbilled | ​ |  | 52,052 | ​ |  | 56,408
Other receivables | ​ |  | 4,124 | ​ |  | 5,278
Total | ​ |  | 247,755 | ​ |  | 328,346
Less: allowance for doubtful accounts | ​ |  | (5,181) | ​ |  | (4,813)
Accounts receivable, net | ​ | $ | 242,574 | ​ | $ | 323,533
​ 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, |  | 2019 |  | 2018
(in thousands) | ​ |  | ​ | ​ |  | ​
Beginning balance | ​ | $ | 4,813 | ​ | $ | 4,471
Bad debt expense | ​ |  | 1,481 | ​ |  | 588
Accounts written-off | ​ |  | (1,142) | ​ |  | (260)
Recoveries | ​ |  | 29 | ​ |  | 14
Ending balance | ​ | $ | 5,181 | ​ | $ | 4,813
​

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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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