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Income Taxes, Income Taxes continued (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income taxes [Line Items]      
Tax exempt period 2 years    
Accelerated depreciation period 5 years    
Unrecognized tax benefits $ 0    
Corporate tax rate pursuant to Law for the Change in the Tax Burden (in hundredths) 25.00%    
Tax rate (in hundredths) 40.50% 40.50% 40.50%
Reconciliation of unrecognized tax benefits [Roll Forward]      
Beginning balance 2,700 2,700 2,700
Additions / Reductions (2,325) 0 0
Ending balance $ 375 $ 2,700 $ 2,700
Minimum [Member]
     
Income taxes [Line Items]      
Reduction of income tax rates (in years) 7 years    
Succeeding tax exempt period 5 years    
Maximum [Member]
     
Income taxes [Line Items]      
Reduction of income tax rates (in years) 10 years    
Succeeding tax exempt period 8 years    
Israeli subsidiary [Member]
     
Income taxes [Line Items]      
Tax exempt rate (in hundredths) 25.00%    
United Kingdom Tax Authority [Member]
     
Income taxes [Line Items]      
Tax rate (in hundredths) 24.00% 26.00%  
Arrangements Law [Member]
     
Income taxes [Line Items]      
2011 (in hundredths) 24.00%    
2012 (in hundredths) 23.00%    
2013 (in hundredths) 22.00%    
2014 (in hundredths) 21.00%    
2015 (in hundredths) 20.00%    
2016 and thereafter (in hundredths) 18.00%