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OTHER NON-CURRENT LIABILITIES (Tables)
 12 Months Ended
Dec. 31, 2017
Other Liabilities Disclosure [Abstract]  
Schedule of other non-current liabilities
Other non-current liabilities consist of the following as of December 31:
(in thousands)
 
2017
 
2016
 
 
 
 
 
Income tax liabilities (Note 21)
 
$
5,955

 
$
—

Deferred revenue
 
2,101

 
5,680

Other non-current liabilities
 
4,226

 
4,800

 
 
 
 
 
Total
 
$
12,282

 
$
10,480