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DEBT (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2019
Long-term debt disclosure          
Principal $ 135,000   $ 135,000   $ 220,000
Debt Issuance Costs (5,131)   (5,131)   (5,446)
Total debt 129,869   129,869   214,554
Interest expense recognized   $ 300   $ 600  
Repayment of debt     85,000    
Credit Facility          
Long-term debt disclosure          
Principal 135,000   135,000   220,000
Debt Issuance Costs (5,131)   (5,131)   (5,446)
Total debt 129,869   129,869   $ 214,554
Outstanding amount under credit facility 135,000   135,000    
Available under the revolving credit facility $ 865,000   $ 865,000    
Effective interest rate (as percent) 2.99%   2.99%    
Interest expense recognized $ 1,600   $ 3,800    
LIBOR | Credit Facility          
Long-term debt disclosure          
Basis spread on interest rate (as a percent)     1.10%