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Long-Term Debt (Schedule of Long-Term Debt) (Details) - USD ($)
$ in Thousands
9 Months Ended
Mar. 31, 2016
Jun. 30, 2015
Debt Instrument [Line Items]    
Unamortized premium on long-term debt $ 4,997 $ 5,634
Total long-term debt 354,997 355,634
7 3/8% Senior Notes [Member]    
Debt Instrument [Line Items]    
Total long-term debt $ 350,000 $ 350,000
Debt instrument, stated interest rate 7.375% 7.375%
Debt instrument, maturity Mar. 01, 2021