Annual report pursuant to Section 13 and 15(d)

RELATED PARTY TRANSACTIONS - Narrative (Details)

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RELATED PARTY TRANSACTIONS - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Payments to aviation charter [Member] | Steve Hilton, Chairman and CEO [Member]      
Related Party Transaction [Line Items]      
Payments to related parties $ 466 $ 606 $ 580