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Debt Narrative (Details) - USD ($)
$ in Thousands
6 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2019
Debt Instrument [Line Items]      
Interest Paid, Including Capitalized Interest, Operating and Investing Activities $ 193 $ 192  
Unsecured Debt [Member]      
Debt Instrument [Line Items]      
Unsecured Loan, Unused Borrowing Capacity $ 5,000    
Unsecured Loan, Maturity Date Apr. 30, 2021    
Unsecured Loan, Amount Outstanding $ 0   $ 0
Revolving Credit Facility [Member] | Line of Credit [Member]      
Debt Instrument [Line Items]      
Revolving Credit Facility, Current Borrowing Capacity 300,000    
Revolving Credit Facility, Maximum Borrowing Capacity $ 600,000    
Revolving Credit Facility, Expiration Date Feb. 20, 2020    
Long-term Debt     $ 0
Fed Funds Effective Rate Overnight Index Swap Rate [Member] | Revolving Credit Facility [Member] | Line of Credit [Member]      
Debt Instrument [Line Items]      
Basis Spread on Variable Rate 0.50%    
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Line of Credit [Member]      
Debt Instrument [Line Items]      
Basis Spread on Variable Rate 1.00%    
Prime Rate [Member] | Unsecured Debt [Member]      
Debt Instrument [Line Items]      
Basis Spread on Variable Rate (1.00%)