Revenue (Tables)

9 Months Ended

Sep. 30, 2019

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				Nine Months Ended
	September 30,				September 30,
Revenues	2019		2018		2019		2018
Dredging:
Capital—U.S.	$	62,518	$	105,934	$	214,668	$	252,537
Capital—foreign		12,554		5,045		39,523		13,847
Coastal protection		41,959		42,691		133,897		122,673
Maintenance		30,074		11,581		89,911		38,461
Rivers & lakes		22,670		13,420		69,224		20,046
Total revenues	$	169,775	$	178,671	$	547,223	$	447,564

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

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
Revenues	2019		2018		2019		2018
Dredging:
Federal government	$	134,763	$	144,050	$	431,722	$	313,657
State and local government		18,505		7,107		69,077		77,078
Private		3,953		22,469		6,901		42,982
Foreign		12,554		5,045		39,523		13,847
Total revenues	$	169,775	$	178,671	$	547,223	$	447,564

Schedule of Accounts Receivable

Accounts receivable at September 30, 2019 and December 31, 2018 are as follows:

	September 30,			December 31,
	2019			2018
Completed contracts	$	9,736		$	8,592
Contracts in progress		15,688			48,418
Retainage		5,819			7,969
		31,243			64,979
Allowance for doubtful accounts		(200	)		(200	)
Total accounts receivable—net	$	31,043		$	64,779

Components of Contracts in Progress

The components of contracts in progress at September 30, 2019 and December 31, 2018 are as follows:

	September 30,			December 31,
	2019			2018
Costs and earnings in excess of billings:
Costs and earnings for contracts in progress	$	188,042		$	433,093
Amounts billed		(167,718	)		(416,956	)
Costs and earnings in excess of billings for contracts in progress		20,324			16,137
Costs and earnings in excess of billings for completed contracts		7,171			3,928
Total contract revenues in excess of billings	$	27,495		$	20,065
Current portion of contract revenues in excess of billings	$	25,383		$	17,953
Long-term contract revenues in excess of billings		2,112			2,112
Total contract revenues in excess of billings	$	27,495		$	20,065
Billings in excess of costs and earnings:
Amounts billed	$	(475,765	)	$	(260,691	)
Costs and earnings for contracts in progress		406,378			242,898
Total billings in excess of contract revenues	$	(69,387	)	$	(17,793	)