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Debt (Details) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Long-term Debt Instruments [Line Items]    
Letters of Credit Outstanding, Amount $ 2,698  
Debt Issuance Costs, Gross, Current 105  
Debt Issuance Cost, Gross, Noncurrent 268 $ 294
Revolving Credit Facility [Member]    
Long-term Debt Instruments [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 250,000  
Letters of Credit Outstanding, Amount 2,534 2,441
Line of Credit Facility, Remaining Borrowing Capacity $ 247,466 247,559
Revolving Credit Facility [Member] | Minimum [Member]    
Long-term Debt Instruments [Line Items]    
Line of Credit Facility, Commitment Fee Percentage 0.09%  
Revolving Credit Facility [Member] | Maximum [Member]    
Long-term Debt Instruments [Line Items]    
Line of Credit Facility, Commitment Fee Percentage 0.175%  
Long-term Debt [Member]    
Long-term Debt Instruments [Line Items]    
Debt Instrument, Face Amount $ 125,000  
Long-term Debt $ 119,531 120,313
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 2.25%  
Prudential Facility [Domain]    
Long-term Debt Instruments [Line Items]    
Long-term Debt $ 170,000  
Debt Instrument, Unused Borrowing Capacity, Amount 50,000  
Prudential Facility - Series C [Member]    
Long-term Debt Instruments [Line Items]    
Long-term Debt $ 120,000  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 3.19%  
Prudential Facility - Series D [Member]    
Long-term Debt Instruments [Line Items]    
Long-term Debt $ 50,000  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 3.21%  
State of Ohio Assumed Debt [Member]    
Long-term Debt Instruments [Line Items]    
Debt Instrument, Face Amount $ 2,359  
Long-term Debt $ 1,612 $ 1,669
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 1.50%