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FINANCING ARRANGEMENTS Revolving Credit Facility (Details) - USD ($)
Sep. 30, 2019
Jun. 30, 2019
Debt Instrument [Line Items]    
Long-term debt, net $ 90,000,000 $ 90,000,000
Line of Credit | Revolving Credit Facility    
Debt Instrument [Line Items]    
Long-term debt, net 90,000,000 90,000,000
Maximum borrowing capacity 295,000,000.0 295,000,000
Line of Credit | Revolving Credit Facility | Revolving credit facility    
Debt Instrument [Line Items]    
Long-term debt, net 90,000,000 $ 90,000,000
Unused borrowing capacity, amount 183,500,000  
Line of Credit | Letter of Credit | Revolving credit facility    
Debt Instrument [Line Items]    
Long-term line of credit $ 21,500,000