Derivative Instruments, Gain (Loss) On Derivative Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Foreign exchange contracts- change in fair value	$ (125)	$ 34	$ (302)	$ (53)
Remeasurement of related contract receivables, billings in excess of revenue earned, and subcontractor accruals	(86)	(14)	(44)	(6)
(Loss) gain on derivative instruments, net	$ (211)	$ 20	$ (346)	$ (59)