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Debt - Availability Under The Senior Credit Facility (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Jun. 30, 2018
Debt Disclosure [Abstract]    
Senior credit facility $ 300,000 $ 300,000
Capacity Constraint Due To Senior Leverage Ratio 205,437 189,741
Line Of Credit Facility Maximum Borrowing Capacity After Consideration Of Capacity Constraint 94,563 110,259
Line of Credit Facility, Amount Outstanding 0 0
Letters of credit subject to the credit facility 28,716 37,073
Availability under the senior credit facility $ 65,847 $ 73,186