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Valuation and Qualifying Accounts
12 Months Ended
Dec. 31, 2013
Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts
Valuation and Qualifying Accounts
(US $ in thousands)    
                     
        Charges   Charges        
        to   to        
    Beginning   Costs and   Other   Deductions   End of
    of year   Expenses   Accounts   (1)   Year
                     
Allowance for doubtful accounts:                                
 Year ended December 31, 2011     339       158       -       (98 )     399  
 Year ended December 31, 2012     399       46       -       (414 )     31  
 Year ended December 31, 2013     31       30       -       (4 )     57  
                                         
Allowance for net deferred                                        
tax assets:                                        
 Year ended December 31, 2011     22,342       -       (1,916 )     (1,456 )     18,970  
 Year ended December 31, 2012     18,970       -       -       1,811       20,781  
 Year ended December 31, 2013     20,781       -       -       63       20,844  

 

(1) Write-off, net of recoveries for the allowance for doubtful accounts.