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OTHER NON-CURRENT LIABILITIES (Tables)
 9 Months Ended
Sep. 30, 2019
Other Liabilities Disclosure [Abstract]  
Schedule of other non-current liabilities
Other non-current liabilities consist of the following:
(in thousands)
 
September 30,
2019
 
December 31,
2018
 
 
 
 
 
Operating lease liabilities
 
$
16,301

 
$
—

Income tax liabilities
 
6,980

 
7,069

Deferred revenue
 
85

 
19

Other non-current liabilities
 
406

 
2,090

 
 
 
 
 
Total
 
$
23,772

 
$
9,178