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Revenue From Contracts With Customers (Tables)
 6 Months Ended
Jun. 30, 2018
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue
Revenue by major end market (amounts in thousands):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
Heavy Highway
$
126,554

 
$
149,749

 
$
233,962

 
$
259,135

Commercial
29,110

 
8,733

 
57,628

 
11,840

Aviation
27,832

 
22,857

 
51,084

 
33,447

Water Containment and Treatment
15,521

 
13,274

 
30,516

 
22,870

Other
24,267

 
14,581

 
37,334

 
35,318

Heavy Civil Construction Revenue
$
223,284

 
$
209,194

 
$
410,524

 
$
362,610

Revenue by contract type (amounts in thousands):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
Fixed Unit Price
$
194,486

 
$
190,435

 
$
354,721

 
$
334,795

Lump Sum and Other
28,798

 
18,759

 
55,803

 
27,815

Heavy Civil Construction Revenue
$
223,284

 
$
209,194

 
$
410,524

 
$
362,610
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):
 
June 30,
2018
 
December 31,
2017
Costs and estimated earnings in excess of billings on uncompleted contracts
$
36,388

 
$
37,112

Billings in excess of costs and estimated earnings on uncompleted contracts
(58,304
)
 
(62,374
)
Net amount of costs and estimated earnings on uncompleted contracts below billings
$
(21,916
)
 
$
(25,262
)