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Contracts in Process (Tables)
 12 Months Ended
Dec. 31, 2016
Costs in Excess of Billings and Billings in Excess of Costs [Table Text Block]

The net asset position for contracts in process consisted of the following at December 31:
 
 
(in thousands)
 
2016
 
2015
Costs and estimated earnings on uncompleted contracts
 
$
2,194,695
 
 
$
2,153,085
 
Less: Billings to date
 
 
2,167,066
 
 
 
2,142,213
 
  
 
$
27,629
 
 
$
10,872
 
Consolidated Balance Sheet [Member]  
Costs in Excess of Billings and Billings in Excess of Costs [Table Text Block]

The net asset position for contracts in process is included in the accompanying consolidated balance sheets as follows at December 31:
 
 
(in thousands)
 
2016
 
2015
Costs and estimated earnings in excess of billings on uncompleted contracts
 
$
69,950
 
 
$
51,486
 
Billings in excess of costs and estimated earnings on uncompleted contracts
 
 
(42,321
) 
 
 
(40,614
) 
  
 
$
27,629
 
 
$
10,872