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Contracts in Progress
 6 Months Ended
Jun. 30, 2018
Contractors [Abstract]  
Contracts in Progress
Contracts in Progress

Contracts in progress are as follows at June 30, 2018 and December 31, 2017:
 
June 30,
2018
 
December 31,
2017
Costs incurred on uncompleted contracts
$
739,863

 
$
668,848

Estimated earnings
140,773

 
120,751

 
880,636

 
789,599

Less: Billings to date
(852,418
)
 
(777,516
)
 
$
28,218

 
$
12,083

Included in the accompanying Consolidated Balance Sheet under the following captions:
 

 
 

Costs and estimated earnings in excess of billings on uncompleted contracts
$
53,287

 
$
46,006

Billings in excess of costs and estimated earnings on uncompleted contracts
(25,069
)
 
(33,923
)
 
$
28,218

 
$
12,083



As of June 30, 2018 and December 31, 2017, included in cost and estimated earnings in excess of billings on uncompleted projects is approximately $15.6 million related to claims and unapproved change orders. Revenue recognized for the three and six months ended June 30, 2018 that was included in "Billings in excess of costs and estimated earnings on uncompleted contracts" (i.e. Contract Liabilities) as of December 31, 2017 was approximately $12.9 million and $19.6 million, respectively.