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Contracts in Progress (Tables)
 12 Months Ended
Dec. 31, 2016
Contractors [Abstract]  
Schedule of Costs and Recognized Earnings in Excess of Billings on Uncompleted Contracts and Billings in Excess of Costs and Recognized Earnings on Uncompleted Contracts
Costs and recognized earnings in excess of billings on uncompleted contracts and billings in excess of costs and recognized earnings on uncompleted contracts consist of the following (in thousands):
 
 
December 31,
 
 
2016
 
2015
Costs incurred on contracts in progress
 
$
638,679

 
$
597,656

Estimated earnings
 
149,910

 
99,985

 
 
788,589

 
697,641

Less progress billings
 
816,622

 
679,532

 
 
$
(28,033
)

$
18,109

The above is included in the accompanying Consolidated Balance Sheet under the following captions:
 
 

 
 

Costs and recognized earnings in excess of billings on uncompleted contracts
 
$
15,188

 
$
39,310

Billings in excess of costs and recognized earnings on uncompleted contracts
 
43,221

 
21,201

 
 
$
(28,033
)
 
$
18,109