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Debt - Availability Under The Senior Credit Facility (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Jun. 30, 2020
Debt Disclosure [Abstract]    
Senior credit facility $ 200,000 $ 300,000
Capacity Constraint Due To Senior Leverage Ratio 131,690 162,864
Line Of Credit Facility Maximum Borrowing Capacity After Consideration Of Capacity Constraint 68,310 137,136
Letters of credit subject to the credit facility 34,899 34,529
Borrowings under senior secured revolving credit facility 0 9,208
Availability under the senior credit facility $ 33,411 $ 93,399