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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Cash flows from continuing operating activities      
Net income $ 83,842 $ 29,574 $ 21,584
Adjustments to reconcile net income to net cash provided by continuing operating activities:      
Net loss from discontinued operations 142 141 265
Deferred income taxes 8,688 2,310 11,231
Losses (gain) on extinguishment of debt 136 52 (1,783)
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 (151)    
Losses on sales and disposals of property and equipment 1,280 460 378
Gain on property insurance recoveries associated with property, plant and equipment   (7,500)  
Depreciation of property, plant and equipment 18,762 17,329 15,601
Amortization 440 651 757
Stock-based compensation 1,099 1,005 1,021
Provisions for losses on accounts receivable 347 145 90
Provisions for (realization of) losses on inventory 590 184 (2,404)
Provision for (realization of) losses on firm sales commitments   (371) 371
Equity in earnings of affiliate (543) (1,003) (996)
Distributions received from affiliate 1,649 825 786
Changes in fair value of commodities contracts (11) (761) (138)
Changes in fair value of interest rate contracts 346 (34) (508)
Other   (10)  
Cash provided (used) by changes in assets and liabilities (net of effects of discontinued operations):      
Accounts receivable (13,451) (17,340) 22,118
Inventories 60 (9,277) 11,880
Prepaid and accrued income taxes (12,805) 5,947 (2,738)
Other supplies, prepaid items and other (8,755) (1,585) 230
Accounts payable 2,175 15,556 (6,154)
Commodities contracts 761 150 (5,922)
Customer deposits 1,919 1,951 (2,607)
Deferred rent expense     (1,424)
Other current and noncurrent liabilities 2,506 5,802 (3,965)
Net cash provided by continuing operating activities 89,971 44,201 57,673
Cash flows from continuing investing activities      
Capital expenditures (44,221) (34,475) (28,891)
Proceeds from property insurance recovery associated with property, plant and equipment   8,829 364
Proceeds from sales of property and equipment 112 99 15
Purchases of short-term investments (10,014) (30,009) (10,051)
Proceeds from short-term investments 10,012 30,057  
Proceeds from (deposits of) restricted cash   (1) 863
Proceeds from sales of carbon credits 2,597    
Payments on contractual obligations - carbon credits (2,266)    
Other assets (816) (488) (360)
Net cash used by continuing investing activities (44,596) (25,988) (38,060)
Cash flows from continuing financing activities      
Proceeds from revolving debt facility 669,739 540,098 519,296
Payments on revolving debt facility (669,739) (540,098) (519,296)
Proceeds from secured term loan, net of fees 14,766    
Proceeds from modification of secured term loan, net of fees 10,347    
Proceeds from other long-term debt, net of fees   47 8,566
Payments associated with induced conversion of 5.5% convertible debentures (558)    
Acquisitions of 5.5% convertible debentures   (2,494) (8,938)
Payments on other long-term debt (15,345) (8,909) (2,327)
Payments on loans secured by cash value of life insurance policies (84) (380)  
Payments of debt issuance costs (112)   (26)
Proceeds from short-term financing 6,775 4,585 3,866
Payments on short-term financing (4,950) (3,781) (3,077)
Proceeds from exercises of stock options 1,197 829 609
Purchases of treasury stock   (2,421) (3,200)
Excess income tax benefit associated with stock-based compensation 1,160 185 911
Dividends paid on preferred stocks (305) (305) (306)
Net cash provided (used) by continuing financing activities 12,891 (12,644) (3,922)
Cash flows of discontinued operations:      
Operating cash flows (283) (362) (156)
Net increase in cash and cash equivalents 57,983 5,207 15,535
Cash and cash equivalents at beginning of year 66,946 61,739 46,204
Cash and cash equivalents at end of year 124,929 66,946 61,739
Cash payments for:      
Interest on long-term debt and other 6,547 6,954 6,908
Income taxes, net of refunds 49,129 11,373 5,559
Noncash investing and financing activities:      
Receivables associated with property insurance claims   171 846
Current assets, accounts payable, other liabilities, and long-term debt associated with additions of property, plant and equipment 6,289 5,420 5,023
Debt issuance costs incurred associated with secured term loan 839    
Debt issuance costs written off associated with 5.5% debentures 353 58 379
Accrued liabilities extinguished associated with 5.5% debentures 349    
5.5% debentures converted to common stock $ 26,900