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Construction Contracts (Tables)
 6 Months Ended
Jun. 30, 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) as of June 30, 2018 and December 31, 2017 were as follows (in thousands):

 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2018
 
2017
 
2018
 
2017
Beginning backlog
 
$
30,733

 
$
157,722

 
$
49,167

 
$
217,718

New contracts/change orders
 
27,807

 
15,519

 
32,376

 
18,960

Work performed
 
(20,619
)
 
(56,584
)
 
(43,622
)
 
(120,021
)
Ending backlog
 
$
37,921

 
$
116,657

 
$
37,921

 
$
116,657

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, 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
 
—

 
1,898

Transferred to receivables
 
(245
)
 
—

Construction contract costs and estimated earnings not billed during the period
 
1,287

 
—

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

 
(187
)
Balance as of June 30, 2018
 
$
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, 2018 and December 31, 2017 (in thousands):

 
June 30,
2018
 
December 31,
2017
Costs incurred on uncompleted construction contracts
$
562,879

 
$
520,368

Estimated earnings
19,222

 
18,070

Billings
(582,525
)
 
(541,784
)
Net position
$
(424
)
 
$
(3,346
)

 
June 30,
2018
 
December 31,
2017
Construction contract costs and estimated earnings in excess of billings
$
1,287

 
$
245

Billings in excess of construction contract costs and estimated earnings
(1,711
)
 
(3,591
)
Net position
$
(424
)
 
$
(3,346
)