Receivables (Tables)

9 Months Ended

Sep. 30, 2016

Receivables [Abstract]

Components of Contract Receivables

Our receivables principally relate to contracts with the U.S. government and prime contractors or subcontractors of the U.S. government. The components of contract receivables are presented in the table below.

	September 30, 2016			December 31, 2015
Billed receivables	$	95,228		$	229,358
Unbilled receivables		271,805			163,882
Allowance for doubtful accounts		(11,758	)		(11,480	)
Total receivables, net	$	355,275		$	381,760