Income Taxes - Components of the Temporary Differences (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011
Deferred Tax Assets: [Abstract]
Postretirement benefits	$ 26,014	$ 27,568	$ 18,260
Accrued liabilities	4,477	3,958	4,138
Capital loss carryforward	1,105	2,865	2,945
Net operating loss carryforward	44,607	44,736	36,328
Intangible assets	694	919	0
Other	7,840	3,080	5,458
Total deferred tax assets	84,737	83,126	67,129
Deferred tax liabilities: [Abstract]
Fixed assets	(2,641)	(4,117)	(7,881)
Intangible Assets	0	0	(1,032)
Other	(882)	(794)	(814)
Total deferred tax liabilities	(3,523)	(4,911)	(9,727)
Valuation allowance	(82,522)	(79,448)	(58,712)
Net deferred tax liability	$ 1,308	$ 1,233	$ 1,310