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Construction Contracts (Tables)
 9 Months Ended
Sep. 30, 2020
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) as of September 30, 2020 and 2019 were as follows (in thousands):
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
2020
 
2019
 
2020
 
2019
Beginning backlog
 
$
193,742

 
$
178,632

 
$
242,622

 
$
165,863

New contracts/change orders
 
(12,461
)
 
22,054

 
43,469

 
73,250

Work performed
 
(58,590
)
 
(27,594
)
 
(163,400
)
 
(66,021
)
Ending backlog
 
$
122,691

 
$
173,092

 
$
122,691

 
$
173,092


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 nine months ended September 30, 2020 and 2019 (in thousands):
 
 
Nine Months Ended 
September 30, 2020
 
Nine Months Ended 
September 30, 2019
 
 
Construction contract costs and estimated earnings in excess of billings
 
Billings in excess of construction contract costs and estimated earnings
 
Construction contract costs and estimated earnings in excess of billings
 
Billings in excess of construction contract costs and estimated earnings
Beginning balance
 
$
249

 
$
5,306

 
$
1,358

 
$
3,037

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

 
(5,306
)
 
—

 
(3,037
)
Increases due to new billings, excluding amounts recognized as revenue during the period
 
—

 
7,237

 
—

 
4,256

Transferred to receivables
 
(468
)
 
—

 
(2,015
)
 
—

Construction contract costs and estimated earnings not billed during the period
 
215

 
—

 
624

 
—

Changes due to cumulative catch-up adjustment arising from changes in the estimate of the stage of completion
 
219

 
(152
)
 
657

 
(923
)
Ending balance
 
$
215

 
$
7,085

 
$
624

 
$
3,333
Net position of uncompleted construction contracts
The Company’s net position on uncompleted construction contracts comprised the following as of September 30, 2020 and December 31, 2019 (in thousands):
 
September 30, 2020
 
December 31, 2019
Costs incurred on uncompleted construction contracts
$
852,966

 
$
695,564

Estimated earnings
30,354

 
24,553

Billings
(890,190
)
 
(725,174
)
Net position
$
(6,870
)
 
$
(5,057
)
 
 
 
 
Construction contract costs and estimated earnings in excess of billings
$
215

 
$
249

Billings in excess of construction contract costs and estimated earnings
(7,085
)
 
(5,306
)
Net position
$
(6,870
)
 
$
(5,057
)