Derivative Instruments, Gain (Loss) On Derivative Instruments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Foreign exchange contracts- change in fair value	$ 58	$ (481)	$ 312	$ (480)
Remeasurement of related contract receivables, billings in excess of revenue earned, and subcontractor accruals	11	403	(134)	259
Gain (loss) on derivative instruments, net	$ 69	$ (78)	$ 178	$ (221)