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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Cash flows from continuing operating activities    
Net income $ 14,303 $ 20,903
Adjustments to reconcile net income to net cash provided by continuing operating activities:    
Net loss from discontinued operations 21 57
Deferred income taxes 1,337 (37)
Expense associated with modification of secured term loan   387
Expense associated with induced conversion of 5.5% convertible debentures   558
Loss (gain) on sales and disposals of property and equipment 15 (19)
Depreciation of property, plant and equipment 5,018 4,592
Amortization 87 153
Stock-based compensation 415 254
Provisions for losses on accounts receivable 40 42
Provisions for (realization of) losses on inventory 5 (15)
Provision for losses on firm sales commitments 2,984  
Equity in earnings of affiliate (171) (285)
Distributions received from affiliate 429 400
Changes in fair value of commodities contracts (142) 82
Changes in fair value of interest rate contracts (270) (52)
Cash provided (used) by changes in assets and liabilities: (net of effects of discontinued operations)    
Accounts receivable (215) (1,871)
Inventories (9,123) (10,649)
Prepaid and accrued income taxes 1,686 2,300
Other supplies, prepaid items and other 1,174 (2,747)
Accounts payable (5,628) (4,488)
Accrued payroll and benefits (1,122) 2,301
Commodities contracts   501
Customer deposits 474 3,588
Other current and noncurrent liabilities (202) 382
Net cash provided by continuing operating activities 11,115 16,337
Cash flows from continuing investing activities    
Capital expenditures (15,632) (4,579)
Proceeds from sales of property and equipment 266 19
Proceeds from short-term investments 4 10,012
Purchase of short-term investments (4) (9)
Proceeds from sales of carbon credits   673
Payments on contractual obligations - carbon credits (180) (673)
Other assets (99) (86)
Net cash provided (used) by continuing investing activities (15,645) 5,357
Cash flows from continuing financing activities    
Proceeds from revolving debt facility 161,506 156,715
Payments on revolving debt facility (161,506) (156,715)
Proceeds from modification of secured term loan, net of fees   10,347
Payments on other long-term debt (3,439) (541)
Payments on loans secured by cash value of life insurance policies (1,918)  
Payments of debt issuance costs   (108)
Payments on short-term financing (1,684) (1,139)
Proceeds from exercises of stock options 173 513
Excess income tax benefit associated with stock-based compensation 186 703
Acquisition of redeemable preferred stock (39)  
Dividends paid on preferred stocks (300) (305)
Net cash provided (used) by continuing financing activities (7,021) 9,470
Cash flows of discontinued operations:    
Operating cash flows (36) (65)
Net increase (decrease) in cash and cash equivalents (11,587) 31,099
Cash and cash equivalents at beginning of period 124,929 66,946
Cash and cash equivalents at end of period 113,342 98,045
Supplemental cash flow information:    
Cash payments for income taxes, net of refunds 4,581 8,654
Noncash investing and financing activities:    
Other assets and accounts payable associated with additions of property, plant and equipment 3,208 2,507
Debt issuance costs incurred associated with secured term loan   601
Debt issuance costs written off associated with 5.5% debentures   328
Accounts payable associated with 5.5% debentures   558
Accrued liabilities extinguished associated with 5.5% debentures   336
5.5% debentures converted to common stock   $ 24,400