Derivative Instruments (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2013 USD ($)	Sep. 30, 2012 USD ($)	Sep. 30, 2013 USD ($)	Sep. 30, 2012 USD ($)	Sep. 30, 2013 EUR (€)	Sep. 30, 2013 GBP (£)	Sep. 30, 2013 JPY (¥)	Dec. 31, 2012 EUR (€)	Dec. 31, 2012 GBP (£)	Dec. 31, 2012 JPY (¥)	Sep. 30, 2013 Not designated as Hedges [Member] USD ($)	Dec. 31, 2012 Not designated as Hedges [Member] USD ($)	Sep. 30, 2013 Not designated as Hedges [Member] Prepaid Expenses and Other Current Assets [Member] USD ($)	Dec. 31, 2012 Not designated as Hedges [Member] Prepaid Expenses and Other Current Assets [Member] USD ($)	Sep. 30, 2013 Not designated as Hedges [Member] Other assets [Member] USD ($)	Dec. 31, 2012 Not designated as Hedges [Member] Other assets [Member] USD ($)	Sep. 30, 2013 Not designated as Hedges [Member] Other Current Liabilities [Member] USD ($)	Dec. 31, 2012 Not designated as Hedges [Member] Other Current Liabilities [Member] USD ($)	Sep. 30, 2013 Not designated as Hedges [Member] Other liabilities [Member] USD ($)	Dec. 31, 2012 Not designated as Hedges [Member] Other liabilities [Member] USD ($)
Derivative Instruments [Abstract]
Foreign exchange contract outstanding					€ 17,700,000	£ 400,000	¥ 11,800,000	€ 9,900,000	£ 800,000	¥ 61,800,000
Estimated fair value of the contracts in the consolidated balance sheets [Abstract]
Asset derivatives											148,000	316,000	141,000	296,000	7,000	20,000
Liability derivatives											(660,000)	(339,000)					(653,000)	(190,000)	(7,000)	(149,000)
Net fair value											(512,000)	(23,000)
Gain (loss) from derivative instruments [Abstract]
Foreign exchange contracts- change in fair value	(481,000)	(134,000)	(480,000)	(42,000)
Remeasurement of related contract receivables, billings in excess of revenue earned, and subcontractor accruals	403,000	154,000	259,000	78,000
Gain (loss) on derivative, net	$ (78,000)	$ 20,000	$ (221,000)	$ 36,000