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Debt - Availability Under The Senior Credit Facility (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Debt Disclosure [Abstract]    
Senior credit facility $ 300,000 $ 300,000
Capacity Constraint Due To Senior Leverage Ratio 72,174 94,323
Line Of Credit Facility Maximum Borrowing Capacity After Consideration Of Capacity Constraint 227,826 205,677
Line of Credit Facility, Amount Outstanding 48,040 48,147
Letters of credit subject to the credit facility 11,366 5,347
Availability under the senior credit facility $ 168,420 $ 152,183