CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities:
Net income (loss)	$ 9,021	$ (5,484)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	21,335	24,778
Provision for (recovery of) doubtful accounts	78	(890)
Deferred income taxes	110	111
Net gains on sales of assets	(13)	(4,388)
ESOP and share-based compensation expense	3,415	2,639
Net losses on derivatives and investments	4,235	9,315
Change in operating assets and liabilities:
Restricted cash	8,084	(2,140)
Purchases of trading securities held for investment	(4,456)	(6,408)
Proceeds from sales of trading securities held for investment	3,443	5,452
Accounts and notes receivable	(818)	(1,167)
Inventories	(10,397)	(1,291)
Income tax receivable	234	645
Derivative assets, net	(7,059)	0
Prepaid expenses and other assets	309	522
Accounts payable	6,665	3,737
Accrued payroll expenses and other current liabilities	(51)	(6,657)
Accrued postretirement benefits	(1,028)	462
Other long-term liabilities	747	(1,416)
Net cash provided by operating activities	33,854	17,820
Cash flows from investing activities:
Purchases of property, plant and equipment	(19,340)	(10,118)
Proceeds from sales of property, plant and equipment	378	5,556
Net cash used in investing activities	(18,962)	(4,562)
Cash flows from financing activities:
Proceeds from revolving credit facility	33,871	22,550
Repayments on revolving credit facility	(45,001)	(32,771)
Payments of capital lease obligations	(2,725)	(2,613)
Proceeds from stock option exercises	1,441	1,195
Net cash used in financing activities	(12,414)	(11,639)
Net increase in cash and cash equivalents	2,478	1,619
Cash and cash equivalents at beginning of year	2,678	3,906
Cash and cash equivalents at end of year	$ 5,156	$ 5,525