Receivables (Tables)
 9 Months Ended
Sep. 29, 2017
Receivables [Abstract]  
Schedule of Receivables
Receivables were comprised of the following:
 
 
September 29,
 
December 31,
(In thousands)
 
2017
 
2016
Billed receivables
 
$
31,750

 
$
41,992

Unbilled contract receivables
 
140,483

 
127,150

Other
 
2,710

 
2,930

Receivables
 
$
174,943

 
$
172,072