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Debt - Availability Under The Senior Credit Facility (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Jun. 30, 2016
Debt Disclosure [Abstract]    
Senior credit facility $ 200,000 $ 200,000
Capacity Constraint Due To Senior Leverage Ratio 24,395 20,138
Line Of Credit Facility Maximum Borrowing Capacity After Consideration Of Capacity Constraint 175,605 179,862
Line of Credit Facility, Amount Outstanding 17,186 0
Letters of credit subject to the credit facility 20,784 20,755
Availability under the senior credit facility $ 137,635 $ 159,107