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Contracts in Progress (Tables)
 3 Months Ended
Mar. 31, 2016
Contractors [Abstract]  
Schedule of Contract Cost and Recognized Income Not Yet Billed and Related Amounts
Contract cost and recognized income not yet billed and related amounts billed as of March 31, 2016 and December 31, 2015 was as follows (in thousands):
 
 
March 31,
2016
 
December 31,
2015
Cost incurred on contracts in progress
 
$
454,133

 
$
567,144

Recognized income
 
15,232

 
50,812

 
 
469,365

 
617,956

Progress billings and advance payments
 
(454,119
)
 
(607,397
)
 
 
$
15,246

 
$
10,559

Contract cost and recognized income not yet billed
 
$
26,307

 
$
20,451

Contract billings in excess of cost and recognized income
 
(11,061
)
 
(9,892
)
 
 
$
15,246

 
$
10,559