Revenue (Tables)

3 Months Ended

Mar. 31, 2021

Revenue from Contract with Customer [Abstract]

Schedule of disaggregation of revenue

	Three months ended March 31,
	2021		2020
Marine Segment
Construction	$	43,936	$	53,140
Dredging		24,682		30,899
Specialty Services		3,528		1,910
Marine segment contract revenues	$	72,146	$	85,949
Concrete Segment
Structural	$	16,661	$	21,236
Light Commercial		64,495		59,433
Other		7		2
Concrete segment contract revenues	$	81,163	$	80,671

Total contract revenues $ 153,309 $ 166,620