Income Taxes - Components of the Temporary Differences (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Deferred Tax Assets: [Abstract]
Postretirement benefits	$ 32,481	$ 20,226	$ 27,589
Accrued liabilities	3,958	4,138	4,376
Capital loss carryforward	2,865	2,945	1,971
Net operating loss carryforward	47,114	37,170	17,261
Intangible assets	919	0	0
Other	1,295	4,328	2,464
Total deferred tax assets	88,632	68,807	53,661
Deferred tax liabilities: [Abstract]
Fixed assets	(4,117)	(7,881)	(5,551)
Intangible Assets	0	(1,032)	(4,498)
Other	(794)	(814)	(726)
Total deferred tax liabilities	(4,911)	(9,727)	(10,775)
Valuation allowance	(84,954)	(60,390)	(43,860)
Net deferred tax (liability) asset	$ (1,233)	$ (1,310)	$ (974)