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Accounts Receivable | 12 Months Ended
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Dec. 31, 2019
Receivables [Abstract] |
Accounts Receivable | 3.Accounts Receivable Accounts receivable consisted of the following:
|  | December 31, |
(table only in thousands) |  | 2019 |  |  | 2018 |
Contract receivables |  | $ | 58,881 |  |  | $ | 48,826 |
Trade receivables |  |  | 12,135 |  |  |  | 7,296 |
Allowance for doubtful accounts |  |  | (2,582 | ) |  |  | (2,897 | )
Total accounts receivable |  | $ | 68,434 |  |  | $ | 53,225 |
Balances billed, but not paid by customers under retainage provisions in contracts that are recorded in deferred charges and other assets within the Consolidated Balance Sheets, amounted to approximately $0.9 million at December 31, 2019 and 2018. Retainage receivables on contracts in progress are generally collected within a year or two subsequent to contract completion. Provision for doubtful accounts was $0.3 million, $1.4 million and $3.9 million during 2019, 2018 and 2017, respectively, while accounts charged to the allowance were $0.6 million, $0.8 million and $1.5 million during 2019, 2018 and 2017, 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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