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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Cash flows from continuing operating activities    
Net income $ 40,336 $ 49,548
Adjustments to reconcile net income to net cash provided by continuing operating activities:    
Net loss from discontinued operations 118 110
Deferred income taxes 2,539 1,566
Losses on extinguishment of debt   136
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 551 895
Depreciation of property, plant and equipment 10,079 9,184
Amortization 170 267
Stock-based compensation 829 519
Provisions for losses on accounts receivable 123 121
Provisions for losses on inventory 44 279
Equity in losses (earnings) of affiliate (341) (207)
Distributions received from affiliate 855 825
Changes in fair value of commodities contracts 208 52
Changes in fair value of interest rate contracts (226) 240
Cash provided (used) by changes in assets and liabilities (net of effects of discontinued operations):    
Accounts receivable 2,305 (27,549)
Inventories 1,262 226
Other supplies, prepaid items and other 3,087 (1,256)
Accounts payable (10,476) (1,356)
Accrued payroll and benefits (935) (835)
Accrued and prepaid income taxes 7,375 1,791
Accrued contractual profit-sharing obligation (1,451) 1,637
Deferred revenue on product sales 17 1,472
Customer deposits (3,162) 1,399
Other current and noncurrent liabilities 3,215 1,248
Net cash provided by continuing operating activities 56,522 41,163
Cash flows from continuing investing activities    
Capital expenditures (32,455) (14,556)
Proceeds from sales of property and equipment 203 31
Proceeds from short-term investments 10,022 10,012
Purchase of short-term investments (10,021) (9)
Deposits of restricted cash (208) (52)
Proceeds from sales of carbon credits   1,665
Payments on contractual obligations - carbon credits (180) (1,573)
Other assets (221) (914)
Net cash used by continuing investing activities (32,860) (5,396)
Cash flows from continuing financing activities    
Proceeds from revolving debt facility 209,238 329,797
Payments on revolving debt facility (209,238) (329,797)
Proceeds from modification of secured term loan, net of fees   10,347
Proceeds from secured term loan, net of fees   14,766
Payments associated with induced conversion of 5.5% convertible debentures   (558)
Payments on other long-term debt (4,645) (10,484)
Payments on loans secured by cash value of life insurance policies (1,918)  
Payments of debt issuance costs (88) (108)
Payments on short-term financing (3,376) (2,284)
Proceeds from exercise of stock options 333 940
Excess income tax benefit associated with stock-based compensation 223 1,109
Acquisition of redeemable preferred stock (39)  
Dividends paid on preferred stocks (300) (305)
Net cash provided (used) by continuing financing activities (9,810) 13,423
Cash flows of discontinued operations:    
Operating cash flows (82) (138)
Net increase in cash and cash equivalents 13,770 49,052
Cash and cash equivalents at beginning of period 124,929 66,946
Cash and cash equivalents at end of period 138,699 115,998
Supplemental cash flow information:    
Cash payments for income taxes, net of refunds 13,057 24,619
Noncash investing and financing activities:    
Insurance claims receivable associated with property, plant and equipment 10,364  
Other assets and accounts payable associated with property, plant and equipment 9,418 5,662
Debt issuance costs incurred associated with secured term loan   835
Debt issuance costs written off associated with 5.5% debentures   328
Accrued liabilities extinguished associated with 5.5% debentures   336
5.5% debentures converted to common stock   $ 24,400