Derivative Instruments (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2012 USD ($)	Jun. 30, 2011 USD ($)	Jun. 30, 2012 USD ($)	Jun. 30, 2011 USD ($)	Jun. 30, 2012 EUR (€)	Jun. 30, 2012 GBP (£)	Jun. 30, 2012 JPY (¥)	Dec. 31, 2011 EUR (€)	Dec. 31, 2011 GBP (£)	Dec. 31, 2011 JPY (¥)	Jun. 30, 2012 Not designated as Hedges [Member] USD ($)	Dec. 31, 2011 Not designated as Hedges [Member] USD ($)	Jun. 30, 2012 Not designated as Hedges [Member] Prepaid Expenses and Other Current Assets [Member] USD ($)	Dec. 31, 2011 Not designated as Hedges [Member] Prepaid Expenses and Other Current Assets [Member] USD ($)	Jun. 30, 2012 Not designated as Hedges [Member] Other assets [Member] USD ($)	Dec. 31, 2011 Not designated as Hedges [Member] Other assets [Member] USD ($)	Jun. 30, 2012 Not designated as Hedges [Member] Other Current Liabilities [Member] USD ($)	Dec. 31, 2011 Not designated as Hedges [Member] Other Current Liabilities [Member] USD ($)	Jun. 30, 2012 Not designated as Hedges [Member] Other liabilities [Member] USD ($)	Dec. 31, 2011 Not designated as Hedges [Member] Other liabilities [Member] USD ($)
Derivative Instruments [Abstract]
Foreign exchange contract outstanding					€ 16,300,000	£ 1,100,000	¥ 359,100,000	€ 12,000,000	£ 3,100,000	¥ 383,500,000
Estimated fair value of the contracts in the consolidated balance sheets [Abstract]
Asset derivatives											676,000	483,000	655,000	393,000	21,000	90,000
Liability derivatives											(425,000)	(314,000)					(304,000)	(258,000)	(121,000)	(56,000)
Net fair value											251,000	169,000
Gain (loss) from derivative instruments [Abstract]
Foreign exchange contracts- change in fair value	(93,000)	(716,000)	93,000	(155,000)
Remeasurement of related contract receivables, billings in excess of revenue earned, and subcontractor accruals	(291,000)	306,000	(77,000)	333,000
Gain (loss) on derivative, net	$ (384,000)	$ (410,000)	$ 16,000	$ 178,000