Summary of Significant Accounting Policies, Derivative Instruments (Details)	12 Months Ended
	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2012 EUR (€)	Dec. 31, 2012 GBP (£)	Dec. 31, 2012 JPY (¥)	Dec. 31, 2011 EUR (€)	Dec. 31, 2011 GBP (£)	Dec. 31, 2011 JPY (¥)	Dec. 31, 2012 Not designated as Hedges [Member] USD ($)	Dec. 31, 2011 Not designated as Hedges [Member] USD ($)	Dec. 31, 2012 Not designated as Hedges [Member] Prepaid Expenses and Other Current Assets [Member] USD ($)	Dec. 31, 2011 Not designated as Hedges [Member] Prepaid Expenses and Other Current Assets [Member] USD ($)	Dec. 31, 2012 Not designated as Hedges [Member] Other assets [Member] USD ($)	Dec. 31, 2011 Not designated as Hedges [Member] Other assets [Member] USD ($)	Dec. 31, 2012 Not designated as Hedges [Member] Other Current Liabilities [Member] USD ($)	Dec. 31, 2011 Not designated as Hedges [Member] Other Current Liabilities [Member] USD ($)	Dec. 31, 2012 Not designated as Hedges [Member] Other liabilities [Member] USD ($)	Dec. 31, 2011 Not designated as Hedges [Member] Other liabilities [Member] USD ($)
Derivative Instruments [Abstract]
Foreign exchange contract outstanding				€ 9,900,000	£ 800,000	¥ 61,800,000	€ 12,000,000	£ 3,100,000	¥ 383,500,000
Estimated fair value of the contracts in the consolidated balance sheets [Abstract]
Asset derivatives										316,000	483,000	296,000	393,000	20,000	90,000
Liability derivatives										(339,000)	(314,000)					(190,000)	(258,000)	(149,000)	(56,000)
Net fair value										(23,000)	169,000
Gain (loss) from derivative instruments [Abstract]
Foreign exchange contracts- change in fair value	(202,000)	73,000	(745,000)
Remeasurement of related contract receivables, billings in excess of revenue earned, and subcontractor accruals	81,000	(141,000)	(168,000)
Gain (loss) on derivative, net	$ (121,000)	$ (68,000)	$ (913,000)