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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2014
Accounting Policies [Abstract]  
Schedule of costs and estimated earnings on uncompleted contracts and related amounts billed
Costs and estimated earnings on uncompleted contracts and related amounts billed as of December 31, 2014 and 2013 were as follows (in thousands):  
 
2014
 
2013
Costs incurred on uncompleted contracts
$
7,620,522

 
$
7,794,620

Estimated earnings, thereon
808,549

 
835,820

 
8,429,071

 
8,630,440

Less: billings to date
8,694,425

 
8,921,008

 
$
(265,354
)
 
$
(290,568
)
Such amounts were included in the accompanying Consolidated Balance Sheets at December 31, 2014 and 2013 under the following captions (in thousands):  
 
2014
 
2013
Costs and estimated earnings in excess of billings on uncompleted contracts
$
103,201

 
$
90,727

Billings in excess of costs and estimated earnings on uncompleted contracts
(368,555
)
 
(381,295
)
 
$
(265,354
)
 
$
(290,568
)