Deferred Tax Liability (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Jun. 30, 2012
Deferred revenue	$ 5,846	$ 8,575
Expense reserves (bad debts, insurance, franchise tax and vacation)	12,515	9,349
Net operating loss carryforwards	6,363	9,454
Deferred Tax Assets, Other	1,383	1,410
Deferred tax assets	26,107	28,788
Accelerated tax depreciation	(35,046)	(34,636)
Accelerated tax amortization	(106,147)	(91,379)
Prepaid expenses	(25,779)	(23,331)
Deferred Tax Liabilities, Other	(9,714)	(6,280)
Deferred tax liabilities	(176,686)	(155,626)
Net deferred tax liability before valuation allowance	(150,579)	(126,838)
Valuation allowance	(700)	(350)
Net deferred tax liability	$ (151,279)	$ (127,188)