Accounts Receivable

12 Months Ended

Dec. 31, 2020

Receivables [Abstract]

Accounts Receivable

3.Accounts Receivable

Accounts receivable consisted of the following:

	December 31,
(table only in thousands)	2020			2019
Contract receivables	$	57,435		$	58,881
Trade receivables		8,721			12,135
Allowance for doubtful accounts		(3,110	)		(2,582	)
Total accounts receivable	$	63,046		$	68,434

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 $1.5 million and $0.9 million at December 31, 2020 and 2019, respectively. Retainage receivables on contracts in progress are generally collected within a year or two subsequent to contract completion.

Provision for doubtful accounts was $0.9 million, $0.3 million and $1.4 million during 2020, 2019 and 2018, respectively, while accounts charged to the allowance were $0.4 million, $0.6 million and $0.8 million during 2020, 2019 and 2018, respectively.