Derivative Instruments, Gain (Loss) On Derivative Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Foreign exchange contracts- change in fair value	$ (86)	$ 11	$ (86)	$ 254
Remeasurement of related contract receivables, billings in excess of revenue earned, and subcontractor accruals	55	(6)	7	(145)
(Gain) loss on derivative instruments, net	$ (31)	$ 5	$ (79)	$ 109