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DEBT - Summary of debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Jun. 30, 2018
Debt Instrument [Line Items]    
Debt — short-term $ 24,425 $ 24,425
Debt issuance costs, net (575) (575)
Debt — long-term 448,154 460,352
Debt issuance costs, net (1,846) (2,148)
Term loan facility    
Debt Instrument [Line Items]    
Debt — short-term 25,000 25,000
Debt — long-term $ 450,000 $ 462,500