Long-Term Debt (Narrative) (Details) (USD $)	9 Months Ended		0 Months Ended			0 Months Ended	9 Months Ended
	Mar. 31, 2014	Jun. 30, 2013	Jan. 21, 2011 7 3/8% Senior Notes [Member]	Mar. 31, 2014 7 3/8% Senior Notes [Member]	Jun. 30, 2013 7 3/8% Senior Notes [Member]	Jan. 30, 2014 Additional 7 3/8% Senior Notes [Member]	Mar. 31, 2014 Additional 7 3/8% Senior Notes [Member]
Debt Instrument [Line Items]
Aggregate principle amount	$ 350,000,000	$ 250,000,000	$ 250,000,000
Debt instrument, stated interest rate	7.375%		7.375%	7.375%	7.375%	7.375%
Debt instrument, maturity	Mar. 01, 2021		Mar. 01, 2021
Indebtedness or guarantees over which domestic subsidiary guarantees the company's debt				10,000,000
Debt financing costs, net	7,657,000	6,536,000		6,000,000
Additional aggregate principal amount issued						100,000,000
Percentage of principal amount Senior Notes were sold at							106.75%
Debt financing costs, incurred and capitalized							$ 2,200,000