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Debt - Availability Under The Senior Credit Facility (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Jun. 30, 2015
Debt Disclosure [Abstract]    
Senior credit facility $ 200,000 $ 200,000
Capacity Constraint Due To Senior Leverage Ratio 36,433 54,968
Line Of Credit Facility Maximum Borrowing Capacity After Consideration Of Capacity Constraint 163,567 145,032
Line of Credit Facility, Amount Outstanding 7,226 8,804
Letters of credit subject to the credit facility 23,168 40,587
Availability under the senior credit facility $ 133,173 $ 95,641