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Summary of Significant Accounting Policies, Derivative Instruments (Details)
 12 Months Ended
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2013
EUR (€)
Dec. 31, 2013
GBP (£)
Dec. 31, 2013
JPY (¥)
Dec. 31, 2012
EUR (€)
Dec. 31, 2012
GBP (£)
Dec. 31, 2012
JPY (¥)
Dec. 31, 2013
Foreign Exchange Contract [Member]
Not designated as Hedges [Member]
USD ($)
Dec. 31, 2012
Foreign Exchange Contract [Member]
Not designated as Hedges [Member]
USD ($)
Dec. 31, 2013
Foreign Exchange Contract [Member]
Not designated as Hedges [Member]
Prepaid expenses and other current assets [Member]
USD ($)
Dec. 31, 2012
Foreign Exchange Contract [Member]
Not designated as Hedges [Member]
Prepaid expenses and other current assets [Member]
USD ($)
Dec. 31, 2013
Foreign Exchange Contract [Member]
Not designated as Hedges [Member]
Other assets [Member]
USD ($)
Dec. 31, 2012
Foreign Exchange Contract [Member]
Not designated as Hedges [Member]
Other assets [Member]
USD ($)
Dec. 31, 2013
Foreign Exchange Contract [Member]
Not designated as Hedges [Member]
Other current liabilities [Member]
USD ($)
Dec. 31, 2012
Foreign Exchange Contract [Member]
Not designated as Hedges [Member]
Other current liabilities [Member]
USD ($)
Dec. 31, 2013
Foreign Exchange Contract [Member]
Not designated as Hedges [Member]
Other liabilities [Member]
USD ($)
Dec. 31, 2012
Foreign Exchange Contract [Member]
Not designated as Hedges [Member]
Other liabilities [Member]
USD ($)
Notional Disclosures [Abstract]                                      
Derivative, Maturity Date May 31, 2016                                    
Foreign exchange contract outstanding       € 13,300,000 £ 200,000 ¥ 10,100,000 € 9,900,000 £ 800,000 ¥ 61,800,000                    
Estimated fair value of the contracts in the consolidated balance sheets [Abstract]                                      
Asset derivatives                   142,000 316,000 140,000 296,000 2,000 20,000        
Liability derivatives                   (655,000) (339,000)         (637,000) (190,000) (18,000) (149,000)
Net fair value                   (513,000) (23,000)                
Gain (loss) from derivative instruments [Abstract]                                      
Foreign exchange contracts- change in fair value (489,000) (202,000) 73,000                                
Remeasurement of related contract receivables, billings in excess of revenue earned, and subcontractor accruals 754,000 81,000 (141,000)                                
Gain (loss) on derivative, net $ 265,000 $ (121,000) $ (68,000)