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Construction Contracts (Tables)
 12 Months Ended
Dec. 31, 2018
Contractors [Abstract]  
Summary of balances and changes of construction contracts
The Company's balances and changes in construction contract price allocated to unsatisfied performance obligations (backlog) for each of the three years ended December 31, 2018 were as follows (in thousands):

 
Years Ended December 31, 
 
2018
 
2017
 
2016
Beginning backlog
$
49,167

 
$
217,718

 
$
83,433

New contracts/change orders
192,852

 
25,224

 
293,115

Work performed
(76,156
)
 
(193,775
)
 
(158,830
)
Ending backlog
$
165,863

 
$
49,167

 
$
217,718

The following table summarizes the changes to the balances in the Company’s construction contract costs and estimated earnings in excess of billings account and the billings in excess of construction contract costs and estimated earnings account for the year ended December 31, 2018 (in thousands):

 
 
Construction contract costs and estimated earnings in excess of billings
 
Billings in excess of construction contract costs and estimated earnings
Balance as of January 1, 2018
 
$
245

 
$
3,591

Revenue recognized that was included in the balance at the beginning of the period
 
—

 
(3,591
)
Increases due to new billings, excluding amounts recognized as revenue during the period
 
—

 
4,243

Transferred to receivables
 
(245
)
 
—

Construction contract costs and estimated earnings not billed during the period
 
352

 
—

Changes due to cumulative catch-up adjustment arising from changes in the estimate of the stage of completion
 
1,006

 
(1,206
)
Balance as of December 31, 2018
 
$
1,358

 
$
3,037
Net position of uncompleted construction contracts
The Company’s net position on uncompleted construction contracts comprised the following as of December 31, 2018 and 2017 (in thousands):
 
 
December 31, 
 
2018
 
2017
Costs incurred on uncompleted construction contracts
$
594,006

 
$
520,368

Estimated earnings
20,375

 
18,070

Billings
(616,060
)
 
(541,784
)
Net position
$
(1,679
)
 
$
(3,346
)
 
 
December 31,
 
2018
 
2017
Construction contract costs and estimated earnings in excess of billings
$
1,358

 
$
245

Billings in excess of construction contract costs and estimated earnings
(3,037
)
 
(3,591
)
Net position
$
(1,679
)
 
$
(3,346
)