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FINANCING ARRANGEMENTS Revolving Credit Facility (Details) - USD ($)
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Debt Instrument [Line Items]        
Cash, cash equivalents and marketable securities $ 50,900,000      
Long-term debt 177,500,000 $ 177,500,000    
Liquidity amount 149,700,000      
Cash, cash equivalents, and restricted cash 56,720,000 122,880,000 $ 71,921,000 $ 92,379,000
Current liabilities 213,848,000 237,014,000    
Line of Credit | Revolving Credit Facility | Revolving credit facility        
Debt Instrument [Line Items]        
Long-term debt 177,500,000 $ 177,500,000    
Maximum borrowing capacity 295,000,000.0      
Long-term line of credit 18,700,000      
Unused borrowing capacity, amount 98,800,000      
Minimum liquidity $ 75,000,000.0