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Construction Contracts (Tables)
 3 Months Ended
Mar. 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) as of March 31, 2019 and 2018 were as follows (in thousands):
 
 
Three Months Ended March 31,
 
 
2019
 
2018
Beginning backlog
 
$
165,863

 
$
49,167

New contracts/change orders
 
12,019

 
4,569

Work performed
 
(17,011
)
 
(23,003
)
Ending backlog
 
$
160,871

 
$
30,733

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 three months ended March 31, 2019 and 2018 (in thousands):
 
 
Three Months Ended 
 March 31, 2019
 
Three Months Ended 
 March 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
 
—

 
3,859

 
—

 
2,313

Transferred to receivables
 
(1,358
)
 
—

 
(245
)
 
—

Construction contract costs and estimated earnings not billed during the period
 
17

 
—

 
315

 
—

Changes due to cumulative catch-up adjustment arising from changes in the estimate of the stage of completion
 
300

 
(237
)
 
—

 
(78
)
Ending balance
 
$
317

 
$
3,622

 
$
315

 
$
2,235
Net position of uncompleted construction contracts
The Company’s net position on uncompleted construction contracts comprised the following as of March 31, 2019 and December 31, 2018 (in thousands):
 
March 31, 2019
 
December 31, 2018
Costs incurred on uncompleted construction contracts
$
610,292

 
$
594,006

Estimated earnings
21,100

 
20,375

Billings
(634,697
)
 
(616,060
)
Net position
$
(3,305
)
 
$
(1,679
)
 
 
 
 
Construction contract costs and estimated earnings in excess of billings
$
317

 
$
1,358

Billings in excess of construction contract costs and estimated earnings
(3,622
)
 
(3,037
)
Net position
$
(3,305
)
 
$
(1,679
)