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Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts
Valuation and Qualifying Accounts
(US $ in thousands)
 
         
Charges (credit)
    
Charges
              
         
to
    
to
              
   
Beginning
    
Costs and
    
other
          
End of
  
   
of year
    
Expenses
    
accounts
    
Deductions
    
Year
  
                               
Allowance for doubtful accounts (1):
                              
Year ended December 31, 2015
  
$
116
    
$
(65
)
  
$
-
    
$
(1
)
  
$
50
  
Year ended December 31, 2016
    
50
      
34
      
-
      
-
      
84
  
Year ended December 31, 2017
    
84
      
97
      
(78
)
    
-
      
103
  
 
                                        
Allowance for net deferred tax assets:
                                        
Year ended December 31, 2015
  
$
19,275
    
$
-
    
$
-
    
$
2,868
    
$
22,143
  
Year ended December 31, 2016
    
22,143
      
-
      
-
      
(874
)
    
21,269
  
Year ended December 31, 2017
  
21,269
    
-
    
-
    
(5,368
)
  
15,901
  
 
(1) Write-off net of recoveries for the allowance for doubtful accounts.