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Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Jun. 30, 2017
Availability under senior credit facility    
Senior revolving credit facility $ 300,000 $ 300,000
Capacity Constraint Due To Senior Leverage Ratio 189,741 169,092
Line Of Credit Facility Maximum Borrowing Capacity After Consideration Of Capacity Constraint 110,259 130,908
Borrowings outstanding 0 44,682
Letters of credit issued 37,073 7,825
Availability under the senior credit facility $ 73,186 $ 78,401