Segment Information (Tables)

3 Months Ended

Mar. 31, 2020

Segment Reporting [Abstract]

Schedule of segment reporting

	Three months ended
	March 31,
		2020		2019
Marine
Contract revenues	$	85,949	$	61,487
Operating income (loss)	$	2,855	$	(6,456)
Depreciation and amortization expense	$	(4,776)	$	(4,946)
Total assets	$	255,311	$	213,162
Property, plant and equipment, net	$	112,384	$	118,596
Concrete
Contract revenues	$	80,671	$	81,618
Operating income	$	1,510	$	279
Depreciation and amortization expense	$	(2,116)	$	(2,094)
Total assets	$	129,509	$	127,220
Property, plant and equipment, net	$	16,731	$	18,245