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Segment Information (Tables)
 6 Months Ended
Jun. 30, 2018
Segment Reporting [Abstract]  
Schedule of Segment Reporting
Segment information for the periods presented is provided as follows:

 
Three months ended June 30, 2018
Three months ended June 30, 2017
Six months ended June 30, 2018
Six months ended June 30, 2017
Marine
 
 
 
 
         Contract revenues
$
80,698

$
62,003

$
143,489

$
129,183

         Operating income (loss)
3,642

(8,617
)
9,907

(16,323
)
         Depreciation and amortization expense
(5,295
)
(5,087
)
(10,026
)
(10,342
)
 
 
 
 
 
         Total Assets
$
268,642

$
252,348

$
268,642

$
252,348

         Property, Plant and Equipment, net
128,047

135,492

128,047

$
135,492

 
 
 
 
 
Concrete
 
 
 
 
        Contract revenues
$
79,069

$
75,417

$
153,121

$
146,994

        Operating income
949

6,150

1,753

12,375

        Depreciation and amortization expense
(2,136
)
(2,505
)
(4,185
)
(4,777
)
 
 
 
 
 
        Total Assets
$
163,627

$
174,124

$
163,627

$
174,124

        Property, Plant and Equipment, net
19,636

16,009

19,636

16,009