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Debt (Textuals) (Details) - USD ($)
3 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Long-term Debt Instruments [Line Items]    
Letters of Credit Outstanding, Amount $ 4,768,000 $ 4,540,000
Revolving Credit Facility [Member]    
Long-term Debt Instruments [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 250,000,000  
Letters of Credit Outstanding, Amount 200,000  
Line of Credit Facility, Remaining Borrowing Capacity $ 249,800,000  
Revolving Credit Facility [Member] | Minimum [Member]    
Long-term Debt Instruments [Line Items]    
Line of Credit Facility, Commitment Fee Percentage 0.10%  
Revolving Credit Facility [Member] | Maximum [Member]    
Long-term Debt Instruments [Line Items]    
Line of Credit Facility, Commitment Fee Percentage 0.20%  
Long-term Debt [Member]    
Long-term Debt Instruments [Line Items]    
Debt Instrument, Face Amount $ 780,000,000  
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 1.88%  
Long-term Debt $ 540,500,000 $ 550,250,000
Asset-backed Securities, Securitized Loans and Receivables [Member]    
Long-term Debt Instruments [Line Items]    
Debt Instrument, Face Amount $ 250,000,000  
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 1.06% 1.20%
Debt Instrument, Fee $ 0.0098  
Prudential Facility [Domain]    
Long-term Debt Instruments [Line Items]    
Long-term Debt $ 90,000,000  
Prudential Facility [Domain] | Minimum [Member]    
Long-term Debt Instruments [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 0.25%  
Prudential Facility [Domain] | Maximum [Member]    
Long-term Debt Instruments [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 1.25%  
Prudential Facility - Series C [Member]    
Long-term Debt Instruments [Line Items]    
Debt Instrument, Face Amount $ 120,000,000  
Long-term Debt $ 40,000,000 $ 40,000,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 3.19%  
Prudential Facility - Series D [Member]    
Long-term Debt Instruments [Line Items]    
Debt Instrument, Face Amount $ 50,000,000  
Long-term Debt $ 25,000,000 25,000,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 3.21%  
Prudential Facility - Series E [Member] [Member]    
Long-term Debt Instruments [Line Items]    
Debt Instrument, Face Amount $ 25,000,000  
Long-term Debt   25,000,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 3.08%  
State of Ohio Assumed Debt [Member]    
Long-term Debt Instruments [Line Items]    
Debt Instrument, Face Amount $ 2,359,000  
Long-term Debt $ 786,000 $ 846,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 1.50%