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OTHER NON-CURRENT ASSETS (Tables)
 12 Months Ended
Dec. 31, 2017
Other Assets, Noncurrent Disclosure [Abstract]  
Schedule of Other Non-current Assets
Other non-current assets as of December 31, 2017 and 2016 consisted of the following (in thousands):
 
December 31,
2017
 
December 31,
2016
Escrow deposit
$
28,750

 
$
—

Cost-method investments
—

 
8,000

Other
2,589

 
2,992

Total other non-current assets
$
31,339

 
$
10,992