Receivables (Tables)
 3 Months Ended
Mar. 27, 2015
Receivables [Abstract]  
Schedule of Receivables
Receivables were comprised of the following:

 
March 27,
 
December 31,
(In thousands)
 
2015
 
2014
Billed receivables
 
$
51,848

 
$
41,997

Unbilled contract receivables
 
160,473

 
160,735

Receivables
 
$
212,321

 
$
202,732