Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010
Cash flows from continuing operating activities:
Net income	$ 49,548	[1]	$ 7,727
Adjustments to reconcile net income to net cash provided by continuing operating activities:
Net loss from discontinued operations	110		43
Deferred income taxes	1,566		244
Losses on extinguishment of debt	136		52
Expense associated with modification of secured term loan	387
Expense associated with induced conversion of 5.5% convertible debentures	558
Net gain on Carbon Credits	(94)
Losses on sales and disposals of property and equipment	895		259
Gain on property insurance recoveries associated with property, plant and equipment			(495)
Depreciation of property, plant and equipment	9,184		8,626
Amortization	267		311
Stock-based compensation	519		500
Provision for (recovery of) losses on accounts receivable	121		(35)
Provision for (realization of) losses on inventory	279		(324)
Realization of losses on firm sales commitments			(371)
Equity in earnings of affiliate	(207)		(528)
Distributions received from affiliate	825		240
Changes in fair value of commodities contracts	52		246
Changes in fair value of interest rate contracts	240		348
Other			(10)
Cash provided (used) by changes in assets and liabilities:
Accounts receivable	(27,549)		(16,585)
Inventories	226		4,128
Other supplies, prepaid items and other	(1,256)		1,948
Accounts payable	(1,356)		2,700
Accrued payroll and benefits	(835)		(1,054)
Accrued and prepaid income taxes	1,791		2,392
Accrued contractual profit-sharing obligation	1,637
Deferred revenue on product sales	1,472		263
Customer deposits	1,399		(77)
Other current and noncurrent liabilities	1,248		1,980
Net cash provided by continuing operating activities	41,163		12,528
Cash flows from continuing investing activities:
Capital expenditures	(14,556)		(10,861)
Proceeds from property insurance recoveries associated with property, plant and equipment			1,670
Proceeds from sales of property and equipment	31		11
Proceeds from short-term investments	10,012		20,053
Purchase of short-term investments	(9)		(10,002)
Deposits of restricted cash	(52)		(246)
Proceeds from sales of carbon credits	1,665
Payments on contractual obligations - carbon credits	(1,573)
Other assets	(914)		(326)
Net cash provided (used) by continuing investing activities	(5,396)		299
Cash flows from continuing financing activities:
Proceeds from revolving debt facility	329,797		263,064
Payments on revolving debt facility	(329,797)		(263,064)
Proceeds from modification of secured term loan, net of fees	10,347
Proceeds from secured term loan, net of fees	14,766
Proceeds from other long-term debt, net of fees			47
Payments associated with induced conversion of 5.5% convertible debentures	(558)
Acquisition of 5.5% convertible debentures			(2,494)
Payments on other long-term debt	(10,484)		(2,386)
Payments of debt issuance costs	(108)
Payments on short-term financing	(2,284)		(2,062)
Proceeds from exercise of stock options	940		296
Purchase of treasury stock			(2,421)
Excess income tax benefit associated with stock-based compensation	1,109		189
Dividends paid on preferred stocks	(305)		(305)
Net cash provided (used) by continuing financing activities	13,423		(9,136)
Cash flows of discontinued operations:
Operating cash flows	(138)		(145)
Net increase in cash and cash equivalents	49,052		3,546
Cash and cash equivalents at beginning of period	66,946		61,739
Cash and cash equivalents at end of period	115,998		65,285
Supplemental cash flow information:
Cash payments for income taxes, net of refunds	24,619		3,093
Noncash investing and financing activities:
Receivable associated with a property insurance claim			560
Current other assets, accounts payable and long-term debt associated with property, plant and equipment	5,662		5,548
Debt issuance costs incurred associated with secured term loan	835
Debt issuance costs written off associated with 5.5% debentures	328		58
Accrued liabilities extinguished associated with 5.5% debentures	336
5.5% debentures converted to common stock	$ 24,400

[1] Note: For the six and three months ended June 30, 2011 and 2010, there were no differences between net income and comprehensive income.