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Construction Contracts (Tables)
 6 Months Ended
Jun. 30, 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) as of June 30, 2019 and 2018 were as follows (in thousands):
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2019
 
2018
 
2019
 
2018
Beginning backlog
 
$
160,871

 
$
30,733

 
$
165,863

 
$
49,167

New contracts/change orders
 
39,177

 
27,807

 
51,196

 
32,376

Work performed
 
(21,416
)
 
(20,619
)
 
(38,427
)
 
(43,622
)
Ending backlog
 
$
178,632

 
$
37,921

 
$
178,632

 
$
37,921


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 six months ended June 30, 2019 and 2018 (in thousands):
 
 
Six Months Ended 
 June 30, 2019
 
Six Months Ended 
 June 30, 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
 
—

 
2,541

 
—

 
1,898

Transferred to receivables
 
(1,890
)
 
—

 
(245
)
 
—

Construction contract costs and estimated earnings not billed during the period
 
461

 
—

 
1,287

 
—

Changes due to cumulative catch-up adjustment arising from changes in the estimate of the stage of completion
 
532

 
(752
)
 
—

 
(187
)
Ending balance
 
$
461

 
$
1,789

 
$
1,287

 
$
1,711
Net position of uncompleted construction contracts
The Company’s net position on uncompleted construction contracts comprised the following as of June 30, 2019 and December 31, 2018 (in thousands):
 
June 30, 2019
 
December 31, 2018
Costs incurred on uncompleted construction contracts
$
630,425

 
$
594,006

Estimated earnings
22,383

 
20,375

Billings
(654,136
)
 
(616,060
)
Net position
$
(1,328
)
 
$
(1,679
)
 
 
 
 
Construction contract costs and estimated earnings in excess of billings
$
461

 
$
1,358

Billings in excess of construction contract costs and estimated earnings
(1,789
)
 
(3,037
)
Net position
$
(1,328
)
 
$
(1,679
)