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Debt (Details Textual)
 1 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2013
USD ($)
Mar. 31, 2013
USD ($)
Mar. 31, 2011
Mar. 22, 2013
USD ($)
Dec. 31, 2012
USD ($)
Aug. 06, 2010
USD ($)
Mar. 31, 2013
Revolving credit facility [Member]
USD ($)
Mar. 31, 2013
Letter Of Credit [Member]
USD ($)
Mar. 31, 2013
Line Of Credit [Member]
Mar. 31, 2013
Majority Owned Subsidiary [Member]
USD ($)
Mar. 31, 2013
Majority Owned Subsidiary [Member]
EUR (€)
Aug. 17, 2012
Majority Owned Subsidiary [Member]
EUR (€)
Debt (Textual) [Abstract]                        
Credit facility limit under amended, Terms of the Bank Facility             $ 20,000,000          
Increased limit on letter of credit 22,200,000 22,200,000   25,000,000       10,000,000        
Debt facility agreement amount due to subsidiary                       7,000,000
Debt bank guarantee facility                   2,600,000 2,000,000 3,500,000
Debt Overdraft guarantee facility                   1,500,000 1,200,000 3,500,000
Debt instrument variable interest rate                 3.50%     1.95%
Borrowers solvency ratio                       30.00%
Maximum debt as proportion of EBITDA                       3
Debt instrument variable interest rate description                   3 months Euribor plus 195 basis points 3 months Euribor plus 195 basis points  
Debt (Additional Textual) [Abstract]                        
Extension of termination date of Term Loan   Apr. 01, 2014                    
Financial covenants which require compliance   Mar. 31, 2013                    
Maximum capital expenditures financial covenant   2,500,000                    
Minimum Fixed Charge Coverage Ratio     1.25                  
Maximum total funded debt to EBITDA covenant   2.0                    
Maximum funded debt to EBITDA covenant   3.0                    
Credit agreement fees paid for amendment 105,000,000                      
Excess in aggregate indebtedness 100,000 100,000                    
Outstanding borrowings 800,000 800,000     0              
Extension of termination date of Line of Credit   Apr. 01, 2013                    
Previous limit on letters of credit       20,000,000   5,000,000            
Bank facility covenant compliance Description   the Company was in compliance with all related financial and other restrictive covenants, and we expect continued compliance.                    
Borrowing base 150.00% 150.00%                    
Trailing period   12 months                    
Interest rate, description   interest rate of LIBOR plus 3.5%.                    
Outstanding trade letters of credit $ 2,000,000 $ 2,000,000