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Revenue From Contracts With Customers (Tables)
 9 Months Ended
Sep. 30, 2018
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue
Revenue by major end market (amounts in thousands):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
Heavy Highway
$
151,882

 
$
179,608

 
$
385,843

 
$
438,741

Commercial
32,261

 
15,209

 
89,890

 
27,050

Aviation
30,587

 
22,863

 
81,671

 
56,310

Water Containment and Treatment
18,457

 
20,518

 
48,973

 
43,388

Other
21,357

 
25,080

 
58,691

 
60,398

Heavy Civil Construction Revenue
$
254,544

 
$
263,278

 
$
665,068

 
$
625,887

Revenue by contract type (amounts in thousands):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
Fixed Unit Price
$
208,070

 
$
230,002

 
$
562,791

 
$
564,797

Lump Sum and Other
46,474

 
33,276

 
102,277

 
61,090

Heavy Civil Construction Revenue
$
254,544

 
$
263,278

 
$
665,068

 
$
625,887
Costs in Excess of Billings and Billings in Excess of Costs
The table below reconciles the net excess billings to the amounts included in the condensed consolidated balance sheets at those dates (amounts in thousands):
 
September 30,
2018
 
December 31,
2017
Costs and estimated earnings in excess of billings on uncompleted contracts
$
40,275

 
$
37,112

Billings in excess of costs and estimated earnings on uncompleted contracts
(63,964
)
 
(62,374
)
Net amount of billings in excess of costs and estimated earnings on uncompleted contracts
$
(23,689
)
 
$
(25,262
)