Receivables
 6 Months Ended
Jul. 01, 2016
Receivables [Abstract]  
Receivables
RECEIVABLES
Receivables were comprised of the following:

 
July 1,
 
December 31,
(In thousands)
 
2016
 
2015
Billed receivables
 
$
45,946

 
$
53,070

Unbilled receivables
 
128,610

 
154,658

Other
 
3,127

 
2,833

Receivables
 
$
177,683

 
$
210,561


As of July 1, 2016 and December 31, 2015, all billed receivables are due from the U.S. government, either directly as prime contractor to the U.S. government or as subcontractor to another prime contractor to the U.S. government. Because the Company’s billed receivables are with the U.S. government, the Company does not believe it has a material credit risk exposure.
Unbilled contract receivables represent revenue recognized on long-term contracts in excess of amounts billed as of the balance sheet dates. We estimate that approximately $4.1 million of our unbilled contract receivables as of July 1, 2016 may not be collected within the next 12 months. These amounts relate to requests for equitable adjustments and contract line item realignments with our customers.