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Accounts Receivable | 9 Months Ended
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Sep. 30, 2019
Receivables [Abstract] |
Accounts Receivable |
3. | Accounts Receivable
(table only in thousands) |  | September 30, 2019 |  |  | December 31, 2018 |
Contract receivables |  | $ | 49,925 |  |  | $ | 48,826 |
Trade receivables |  |  | 10,877 |  |  |  | 7,296 |
Allowance for doubtful accounts |  |  | (2,711 | ) |  |  | (2,897 | )
Total accounts receivable |  | $ | 58,091 |  |  | $ | 53,225 |
Balances billed but not paid by customers under retainage provisions in contracts within the Condensed Consolidated Balance Sheets amounted to approximately $1.4 million and $0.9 million at September 30, 2019 and December 31, 2018, respectively. Retainage receivables on contracts in progress are generally collected within a year after contract completion. Bad debt expense was $0.3 million and $0.6 million for the three-month periods ended September 30, 2019 and 2018, respectively, and $0.7 million and $1.2 million for the nine-month periods ended September 30, 2019 and 2018, respectively.

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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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