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Construction Contracts (Tables)
 12 Months Ended
Dec. 31, 2019
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, 2019, 2018 and 2017 were as follows (in thousands):
 
Years Ended December 31, 
 
2019
 
2018
 
2017
Beginning backlog
$
165,863

 
$
49,167

 
$
217,718

New contracts/change orders
182,495

 
192,852

 
25,224

Work performed
(105,736
)
 
(76,156
)
 
(193,775
)
Ending backlog
$
242,622

 
$
165,863

 
$
49,167



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, 2019 and 2018 (in thousands):

 
 
Year ended December 31, 2019
 
Year ended December 31, 2018
 
 
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
 
$
1,358

 
$
3,037

 
$
245

 
$
3,591

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

 
(3,037
)
 
—

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

 
6,283

 
—

 
4,243

Transferred to receivables
 
(2,557
)
 
—

 
(245
)
 
—

Construction contract costs and estimated earnings not billed during the period
 
249

 
—

 
352

 
—

Changes due to cumulative catch-up adjustment arising from changes in the estimate of the stage of completion
 
1,199

 
(977
)
 
1,006

 
(1,206
)
Ending balance
 
$
249

 
$
5,306

 
$
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, 2019 and 2018 (in thousands):
 
 
December 31, 
 
2019
 
2018
Costs incurred on uncompleted construction contracts
$
695,564

 
$
594,006

Estimated earnings
24,553

 
20,375

Billings
(725,174
)
 
(616,060
)
Net position
$
(5,057
)
 
$
(1,679
)
 
 
 
 
Construction contract costs and estimated earnings in excess of billings
$
249

 
$
1,358

Billings in excess of construction contract costs and estimated earnings
(5,306
)
 
(3,037
)
Net position
$
(5,057
)
 
$
(1,679
)