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Income Taxes, Income Taxes continued (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income taxes [Line Items]      
Corporate tax rate pursuant to Law for the Change in the Tax Burden (in hundredths) 25.00%    
Tax Benefits Under Law of Encouragements [Abstract]      
Tax exempt period 2 years    
Accelerated depreciation period 5 years    
Unrecognized tax benefits $ 0    
Rate at which subsidiary earnings are taxed (in hundredths) 35.00% 35.00% 35.00%
Reconciliation of unrecognized tax benefits [Roll Forward]      
Beginning balance 375 2,700 2,700
Additions / Settlements 269 (2,325) 0
Ending balance $ 644 $ 375 $ 2,700
Minimum [Member]
     
Tax Benefits Under Law of Encouragements [Abstract]      
Reduction of income tax rates (in years) 7 years    
Succeeding tax exempt period 5 years    
Maximum [Member]
     
Tax Benefits Under Law of Encouragements [Abstract]      
Reduction of income tax rates (in years) 10 years    
Succeeding tax exempt period 8 years    
Israeli subsidiary [Member]
     
Tax Benefits Under Law of Encouragements [Abstract]      
Tax exempt rate (in hundredths) 15.00%    
Israeli subsidiary [Member] | Current Period [Member]
     
Tax Benefits Under Law of Encouragements [Abstract]      
Preferred income tax rate (in hundredths)   15.00%  
Standard corporate income tax rate (in hundredths)   25.00%  
Israeli subsidiary [Member] | Prospective [Member]
     
Tax Benefits Under Law of Encouragements [Abstract]      
Preferred income tax rate (in hundredths) 16.00%    
Standard corporate income tax rate (in hundredths) 26.50%    
United Kingdom Tax Authority [Member]
     
Tax Benefits Under Law of Encouragements [Abstract]      
Rate at which subsidiary earnings are taxed (in hundredths) 24.00% 23.00%