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OTHER NON-CURRENT LIABILITIES
 6 Months Ended
Jun. 30, 2018
Other Liabilities Disclosure [Abstract]  
OTHER NON-CURRENT LIABILITIES
OTHER NON-CURRENT LIABILITIES
Other non-current liabilities consist of the following:
(in thousands)
 
June 30,
2018
 
December 31,
2017
 
 
 
 
 
Income tax liabilities
 
$
5,605

 
$
5,955

Deferred revenue
 
41

 
2,101

Other non-current liabilities
 
3,761

 
4,226

 
 
 
 
 
Total
 
$
9,407

 
$
12,282