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Long-Term Debt (Summary Of Long-Term Debt) (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Mar. 31, 2015
Jun. 30, 2014
Jan. 30, 2014
Jan. 21, 2011
Debt Instrument [Line Items]        
Unamortized premium on long-term debt $ 5,833us-gaap_DebtInstrumentUnamortizedPremium $ 6,432us-gaap_DebtInstrumentUnamortizedPremium    
Total long-term debt 355,833us-gaap_LongTermDebt 356,432us-gaap_LongTermDebt    
7 3/8% Senior Notes [Member]        
Debt Instrument [Line Items]        
Total long-term debt $ 350,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 $ 350,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		    
Debt instrument, stated interest rate 7.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 7.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 7.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 7.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Debt instrument, maturity Mar. 01, 2021