Receivables (Tables)
 9 Months Ended
Sep. 28, 2018
Receivables [Abstract]  
Schedule of Receivables
Receivables were comprised of the following:
 
 
September 28,
 
December 31,
(In thousands)
 
2018
 
2017
Billed receivables
 
$
28,467

 
$
50,595

Unbilled receivables (contract assets)
 
188,396

 
121,601

Other
 
6,526

 
2,799

Total receivables
 
$
223,389

 
$
174,995