Derivative Instruments, Gain (Loss) On Derivative Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Foreign exchange contracts- change in fair value	$ 34	$ 58	$ (53)	$ 312
Remeasurement of related contract receivables, billings in excess of revenue earned, and subcontractor accruals	(14)	11	(6)	(134)
(Gain) loss on derivative instruments, net	$ 20	$ 69	$ (59)	$ 178