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Contracts in Process
 12 Months Ended
Dec. 31, 2017
Contractors [Abstract]  
Long-term Contracts or Programs Disclosure [Text Block]
5. Contracts in Process
 
The net asset position for contracts in process consisted of the following at December 31:
 
 
(in thousands)
 
2017
 
2016
Costs and estimated earnings on uncompleted contracts
 
$
1,978,981
 
 
$
2,194,695
 
Less: Billings to date
 
 
1,929,640
 
 
 
2,167,066
 
  
 
$
49,341
 
 
$
27,629
 
   
  The net asset position for contracts in process is included in the accompanying consolidated balance sheets as follows at December 31:
 
 
 
(in thousands)
2017
2016
Costs and estimated earnings in excess of billings on uncompleted contracts
$
78,260
$
69,950
Billings in excess of costs and estimated earnings on uncompleted contracts
(28,919
)
(42,321
)
$
49,341
$
27,629