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DEBT (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2019
Long-term debt disclosure      
Principal $ 170,000   $ 220,000
Debt Issuance Costs (5,405)   (5,446)
Total debt 164,595   214,554
Repayment of debt 50,000    
Credit Facility      
Long-term debt disclosure      
Principal 170,000   220,000
Debt Issuance Costs (5,405)   (5,446)
Total debt 164,595   $ 214,554
Outstanding amount under credit facility 170,000    
Available under the revolving credit facility $ 830,000    
Effective interest rate (as percent) 3.24%    
Interest expense recognized $ 2,200 $ 300  
LIBOR | Credit Facility      
Long-term debt disclosure      
Basis spread on interest rate (as a percent) 1.10%