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VALUATION AND QUALIFYING ACCOUNTS VALUATION AND QUALIFYING ACCOUNTS
 12 Months Ended
Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract]  
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
VALUATION AND QUALIFYING ACCOUNTS
FOR THE YEARS ENDED DECEMBER 31, 2017, 2016 AND 2015
(U.S. dollars in thousands)
 
 
Balance at
Beginning of
Year 
 
Additions
 
Deductions/
Write offs
 
Balance at End of Year 
   Year ended December 31, 2017
 
 
 
 
 
 
 
 
Allowance for doubtful accounts for trade receivables
 
$
2,014

 
998

 
(1,826
)
 
$
1,186

Valuation allowance on deferred tax assets
 
$
—

 
924

 
—

 
$
924

   Year ended December 31, 2016
 
 
 
 
 
 
 
 
Allowance for doubtful accounts for trade receivables
 
$
1,729

 
3,500

 
(3,215
)
 
$
2,014

   Year ended December 31, 2015
 
 
 
 
 
 
 
 
Allowance for doubtful accounts for trade receivables
 
$
2,181

 
$
1,704

 
$
(2,156
)
 
$
1,729