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OTHER NON-CURRENT LIABILITIES
 3 Months Ended
Mar. 31, 2019
Other Liabilities Disclosure [Abstract]  
OTHER NON-CURRENT LIABILITIES
OTHER NON-CURRENT LIABILITIES
Other non-current liabilities consist of the following:
(in thousands)
 
March 31,
2019
 
December 31,
2018
 
 
 
 
 
Lease obligation liabilities
 
$
23,202

 
$
—

Income tax liabilities
 
7,109

 
7,069

Deferred revenue
 
52

 
19

Other non-current liabilities
 
404

 
2,090

 
 
 
 
 
Total
 
$
30,767

 
$
9,178