Deferred Tax Liability (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Jun. 30, 2011
Deferred revenue	$ 8,575	$ 5,372
Expense reserves (bad debts, insurance, franchise tax and vacation)	9,349	8,086
Net operating loss carryforwards	9,454	11,097
Deferred Tax Assets, Other	1,410	1,122
Deferred tax assets	28,788	25,677
Accelerated tax depreciation	(34,636)	(29,971)
Accelerated tax amortization	(91,379)	(81,265)
Prepaid expenses	(23,331)	(18,713)
Deferred Tax Liabilities, Other	(6,280)	0
Deferred tax liabilities	(155,626)	(129,949)
Net deferred tax liability before valuation allowance	(126,838)	(104,272)
Valuation allowance	(350)	(306)
Net deferred tax liability	$ (127,188)	$ (104,578)