Receivables (Tables)
 6 Months Ended
Jun. 26, 2015
Receivables [Abstract]  
Schedule of Receivables
Receivables were comprised of the following:

 
June 26,
 
December 31,
(In thousands)
 
2015
 
2014
Billed receivables
 
$
43,754

 
$
41,997

Unbilled contract receivables
 
168,900

 
160,735

Receivables
 
$
212,654

 
$
202,732