Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2011	Jun. 30, 2011
Accounts receivable, allowance for doubtful accounts	$ 2,424	$ 2,292
Property and equipment, accumulated depreciation and amortization	434,859	407,190
Amortizable intangible assets, accumulated amortization	$ 128,411	$ 122,093
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	45,000	45,000
Preferred stock, shares outstanding	0	0
Treasury stock, shares	581	500
Class A Common Stock [Member]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	360,000	360,000
Common stock, shares outstanding	62,207	62,094
Class B Common Stock [Member]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	90,000	90,000
Common stock, shares outstanding	13,589	13,589