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Revenue from Contracts with Customers (Tables)
 12 Months Ended
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue
Revenue by major end market (amounts in thousands):
 
 
Years Ended December 31,
 
 
2018
 
2017
 
2016
Heavy Highway
 
$
513,231

 
$
579,157

 
$
542,011

Commercial
 
120,388

 
48,314

 
31,664

Aviation
 
111,824

 
77,399

 
27,926

Water Containment and Treatment
 
66,928

 
59,593

 
39,918

Other
 
73,600

 
85,503

 
48,604

Heavy Civil Construction Revenue
 
$
885,971

 
$
849,966

 
$
690,123

Revenue by contract type (amounts in thousands):
 
 
Years Ended December 31,
 
 
2018
 
2017
 
2016
Fixed Unit Price
 
$
733,047

 
$
755,840

 
$
665,862

Lump Sum and Other
 
152,924

 
94,126

 
24,261

Heavy Civil Construction Revenue
 
$
885,971

 
$
849,966

 
$
690,123
Costs in Excess of Billings and Billings in Excess of Costs
Included in the accompanying balance sheets under the following captions (amounts in thousands):
 
As of December 31,
 
2018
 
2017
Costs and estimated earnings in excess of billings on uncompleted contracts
$
41,542

 
$
37,112

Billings in excess of costs and estimated earnings on uncompleted contracts
(62,407
)
 
(62,374
)
Net amount of billings in excess of costs and estimated earnings on uncompleted contracts
$
(20,865
)
 
$
(25,262
)
The two tables below set forth the costs incurred and earnings accrued on uncompleted contracts (revenues) compared with the billings on those contracts through December 31, 2018 and 2017 and reconcile the net excess billings to the amounts included in the consolidated balance sheets at those dates (amounts in thousands).
 
As of December 31,
 
2018
 
2017
Costs incurred and estimated earnings on uncompleted contracts
$
3,445,126

 
$
2,380,866

Billings on uncompleted contracts
(3,465,991
)
 
(2,406,128
)
Excess of billings over costs incurred and estimated earnings
$
(20,865
)
 
$
(25,262
)