CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2013	Mar. 31, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities:
Net loss	$ 2,979	$ (7,280)	$ (4,178)	$ (11,093)	$ (5,484)	$ (16,304)	$ (8,462)	$ (26,576)	$ (52,033)	$ (25,359)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	8,340	7,923	16,640	15,821	24,778	23,831	32,542	32,113	31,758	26,778
(Recovery of) provision for doubtful accounts	922	(590)	963	(737)	890	(880)	757	980	(2,024)	(3,188)
Deferred income taxes					(111)	0	74	(78)	338	(1,185)
Goodwill and intangible assets impairment losses							92	5,585	7,805
Net (gains) losses on sales of assets	(3,213)	98	3,202	662	4,388	1,161	(4,466)	(268)	358	430
ESOP and share-based compensation expense	823	790	1,906	1,476	2,639	2,519	3,563	3,287	3,825	4,784
Net losses (gains) on derivative and investments	(802)	2,621	(7,038)	(2,250)	(9,315)	(5,131)	11,132	6,175	(1,312)	9,382
Change in operating assets and liabilities:
Restricted cash	1,483	(168)	1,987	1,353	2,140	1,314	(6,472)	(1,153)	(460)	0
Short-term investments	52	5,967	7,854	(4,532)	10,347	(796)	(11,942)	(1,497)	28,294	912
Accounts and notes receivable	(1,481)	(1,643)	2,053	2,000	1,167	(936)	(2,429)	3,745	(2,929)	(40)
Inventories	(3,943)	(3,192)	2,404	(1,110)	1,291	(3,533)	5,115	13,236	3,640	(12,819)
Income tax receivable	393	279	(289)	(268)	(645)	381	353	(314)	5,392	(1,677)
Prepaid expenses and other assets	120	543	(558)	361	(522)	(81)	(157)	(860)	400	(9)
Accounts payable	2,268	(3,840)	3,885	(1,661)	3,737	(9,291)	1,773	(13,441)	12,493	(121)
Accrued payroll, expenses and other liabilities	(1,542)	304	3,381	348	2,734	2,596	1,741	1,949	2,156	2,362
Accrued postretirement benefits	288	30	351	175	462	243	(6,451)	3,530	(9,557)	5,228
Other long-term liabilities	(1,191)	(3,055)	(1,302)	112	(1,416)	(1,083)	6,678	(6,320)	1,745	3,493
Net cash provided by operating activities	3,652	(33)	10,105	9,699	17,820	11,012	21,927	18,133	33,937	(1,047)
Cash flows from investing activities:
Purchases of property, plant and equipment	(3,572)	(2,910)	(6,396)	(5,808)	(10,118)	(10,533)	(15,894)	(17,498)	(19,416)	(28,484)
Proceeds from sales of property, plant and equipment	3,786	198	3,911	1,227	5,556	2,112	5,666	3,037	2,021	437
Net cash used in investing activities	214	(2,712)	(2,485)	(4,581)	(4,562)	(8,421)	(10,228)	(14,461)	(17,395)
Cash flows from financing activities:
Proceeds from revolving credit facility	4,800	8,400	15,000	9,400	22,550	13,700	43,990	17,250	35,450	33,737
Repayments on revolving credit facility	(9,250)	(6,800)	19,750	15,700	(32,771)	(17,700)	(54,761)	(21,200)	(43,970)	(12,756)
Payments of capital lease obligations	(777)	(384)	1,558	778	(2,613)	(1,209)	(3,359)	(1,897)	(1,433)	(837)
Proceeds from stock option exercises					1,195	0	1,203	0	0
Dividends paid							0	0	(4,657)	(6,939)
Net cash used in financing activities	(5,227)	1,216	(6,308)	(7,078)	(11,639)	(5,209)	(12,927)	(5,847)	(14,610)	13,205
Net (decrease) increase in cash and cash equivalents	(1,361)	(1,529)	1,312	(1,960)	1,619	(2,618)	(1,228)	(2,175)	1,932	(15,889)
Cash and cash equivalents at beginning of year	3,906	6,081	3,906	6,081	3,906	6,081	3,906	6,081	4,149	20,038
Cash and cash equivalents at end of year	2,545	4,552	5,218	4,121	5,525	3,463	2,678	3,906	6,081	4,149
Supplemental disclosure of cash flow information:
Cash paid for interest							1,783		1,945	890
Cash paid for income taxes							370		324	154
Non-cash financing and investing activities:
Equipment acquired under capital leases							$ 626		$ 5,659	$ 3,954