Revenue (Tables)

6 Months Ended

Jun. 30, 2021

Revenue From Contract With Customer [Abstract]

Summary of Contract Revenues by Type of Work and Customer

The Company’s contract revenues by type of work, for the periods indicated, were as follows:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
Revenues	2021		2020		2021		2020
Dredging:
Capital—U.S.	$	79,399	$	63,440	$	157,005	$	146,989
Capital—foreign		1,613		3,981		6,322		10,843
Coastal protection		46,631		56,038		93,262		135,888
Maintenance		37,278		41,968		82,579		84,353
Rivers & lakes		4,993		2,493		8,379		7,542
Total revenues	$	169,914	$	167,920	$	347,547	$	385,615

The Company’s contract revenues by type of customer, for the periods indicated, were as follows:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
Revenues	2021		2020		2021		2020
Dredging:
Federal government	$	127,331	$	133,496	$	258,063	$	299,263
State and local government		37,069		29,693		71,844		72,025
Private		3,901		750		11,318		3,484
Foreign		1,613		3,981		6,322		10,843
Total revenues	$	169,914	$	167,920	$	347,547	$	385,615

Schedule of Accounts Receivable

Accounts receivable at June 30, 2021 and December 31, 2020 are as follows:

	June 30,			December 31,
	2021			2020
Completed contracts	$	12,526		$	12,347
Contracts in progress		15,393			21,239
Retainage		8,386			5,968
		36,305			39,554
Allowance for doubtful accounts		(564	)		(564	)
Total accounts receivable—net	$	35,741		$	38,990

Components of Contracts in Progress

The components of contracts in progress at June 30, 2021 and December 31, 2020 are as follows:

	June 30,			December 31,
	2021			2020
Costs and earnings in excess of billings:
Costs and earnings for contracts in progress	$	317,984		$	199,964
Amounts billed		(291,493	)		(168,569	)
Costs and earnings in excess of billings for contracts in progress		26,491			31,395
Costs and earnings in excess of billings for completed contracts		10,177			2,823
Total contract revenues in excess of billings	$	36,668		$	34,218
Current portion of contract revenues in excess of billings	$	34,556		$	32,106
Long-term contract revenues in excess of billings		2,112			2,112
Total contract revenues in excess of billings	$	36,668		$	34,218
Billings in excess of costs and earnings:
Amounts billed	$	(382,785	)	$	(550,468	)
Costs and earnings for contracts in progress		353,952			517,860
Total billings in excess of contract revenues	$	(28,833	)	$	(32,608	)