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Long-Term Debt (Summary Of Long-Term Debt) (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2015
Jun. 30, 2015
Jan. 30, 2014
Debt Instrument [Line Items]      
Unamortized premium on long-term debt $ 5,422 $ 5,634  
Total long-term debt 355,422 355,634  
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% 7.375%
Debt instrument, maturity Mar. 01, 2021