CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:
Net loss	$ (4,420)	$ (11,694)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	16,640	15,821
(Recovery) provision for doubtful accounts	(963)	737
Net gains on sales of assets	(3,202)	(662)
ESOP and share-based compensation expense	1,906	1,476
Net loss on derivatives and investments	7,038	2,250
Change in operating assets and liabilities:
Short-term investments	(6,587)	3,743
Accounts and notes receivable	(2,053)	(2,000)
Inventories	(2,404)	1,110
Income tax receivable	284	277
Prepaid expenses and other assets	558	(361)
Accounts payable	4,615	(1,712)
Accrued payroll, expenses and other liabilities	(605)	(165)
Accrued postretirement benefits	600	767
Other long-term liabilities	(1,302)	112
Net cash provided by operating activities	10,105	9,699
Cash flows from investing activities:
Purchases of property, plant and equipment	(6,396)	(5,808)
Proceeds from sales of property, plant and equipment	3,911	1,227
Net cash used in investing activities	(2,485)	(4,581)
Cash flows from financing activities:
Proceeds from revolving credit facility	15,000	9,400
Repayments on revolving credit facility	(19,750)	(15,700)
Payments of capital lease obligations	(1,558)	(778)
Net cash used in financing activities	(6,308)	(7,078)
Net increase (decrease) in cash and cash equivalents	1,312	(1,960)
Cash and cash equivalents at beginning of period	3,906	6,081
Cash and cash equivalents at end of period	$ 5,218	$ 4,121