Accounts Receivable

6 Months Ended

Jun. 30, 2022

Receivables [Abstract]

Accounts Receivable

3. Accounts Receivable

(table only in thousands)	June 30, 2022			December 31, 2021
Contract receivables	$	75,841		$	65,932
Trade receivables		23,285			12,537
Allowance for doubtful accounts		(3,808	)		(3,478	)
Total accounts receivable	$	95,318		$	74,991

Balances billed but not paid by customers under retainage provisions in contracts within the Condensed Consolidated Balance Sheets amounted to approximately $1.6 million and $1.8 million at June 30, 2022 and December 31, 2021, respectively. Retainage receivables on contracts in progress are generally collected within a year or two subsequent to contract completion, and are recorded in either accounts receivable, net or deferred charges and other assets within the Condensed Consolidated Balance Sheets depending on timing of expected collection.

Bad debt expense was approximately $0.4 million and $0.1 million for the three-month periods ended June 30, 2022 and 2021, respectively, and $0.4 million and $0.1 million for the six-month periods ended June 30, 2022 and 2021, respectively.