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Long-Term Debt (Narrative) (Details) - USD ($)
Dec. 31, 2015
Jun. 30, 2015
Debt Instrument [Line Items]    
Debt financing costs, net $ 6,960,000 $ 7,396,000
7 3/8% Senior Notes [Member]    
Debt Instrument [Line Items]    
Aggregate principal amount $ 350,000,000  
Debt instrument, stated interest rate 7.375% 7.375%
Indebtedness or guarantees over which domestic subsidiary guarantees the company's debt $ 10,000,000  
Debt financing costs, net $ 6,000,000