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Condensed Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Cash Flows from Operating Activities:    
Net income $ 17,844 $ 37,417
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion and amortization 42,638 39,296
Amortization of financing costs 196 138
Amortization of net gain on treasury lock (462) (462)
Share-based compensation expense 2,594 1,750
Deferred income tax provision 4,505 10,760
Cellulosic biofuel producer credit reduction (amended 2009 return) 142,251  
Alternative fuel mixture credit increase (amended 2009 return) (119,239)  
Loss on disposals of property, plant and equipment 2,412 3,355
Other, net 5,478 5,491
(Increase) decrease in assets -    
Accounts receivable (21,125) (15,657)
Inventories (6,728) 7,226
Prepaid expenses and other current assets (7,662) (3,536)
Increase (decrease) in liabilities -    
Accounts payable (4,930) 15,551
Accrued liabilities (22,827) (37,379)
Net cash provided by operating activities 34,945 63,950
Cash Flows from Investing Activities:    
Additions to property, plant and equipment (34,813) (64,731)
Acquisition of business (35,531)  
Additions to other long term assets (1,406) (2,045)
Proceeds from disposals of property, plant and equipment 11 289
Net cash used for investing activities (71,739) (66,487)
Cash Flows from Financing Activities:    
Payments on long-term debt (3,955) (163)
Settlement of treasury lock   9,910
Common stock dividends paid (19,665) (15,351)
Repurchases of common stock (23,230) (19,095)
Proceeds from exercise of stock options 10,221 3,205
Excess tax benefits from share-based awards 1,127 489
Net cash used for financing activities (35,502) (21,005)
Net decrease in cash and cash equivalents (72,296) (23,542)
Cash and cash equivalents, beginning of period 156,313 196,556
Cash and cash equivalents, end of period $ 84,017 $ 173,014