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Condensed Consolidated Statements of Cash Flows (unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Operating activities    
Net income $ 15,629 $ 18,878
Adjustments to reconcile to net cash provided by operations :    
Depreciation, depletion and amortization 15,358 17,086
Amortization of debt issue costs and original issue discount 327 304
Pension expense, net of unfunded benefits paid 3,577 2,787
Deferred income tax provision (benefit) 906 (955)
Gains on dispositions of plant, equipment and timberlands, net (73) (37)
Share-based compensation 1,878 1,632
Change in operating assets and liabilities    
Accounts receivable (19,475) (13,333)
Inventories (2,100) (9,726)
Prepaid and other current assets 8,885 2,710
Accounts payable 2,331 (1,985)
Environmental matters (13) (13)
Accruals and other current liabilities (16,428) (14,511)
Cellulosic biofuel and alternative fuel mixture credits 5,690 7,403
Other (697) (497)
Net cash provided by operating activities 15,795 9,743
Investing activities    
Expenditures for purchases of plant, equipment and timberlands (31,391) (14,152)
Proceeds from disposals of plant, equipment and timberlands, net 73 49
Other (175)  
Net cash used by investing activities (31,493) (14,103)
Financing activities    
Net repayments of revolving credit facility    (5,000)
Payments of note offering costs (108)  
Repurchase of common stocks   (1,204)
Payments of dividends (3,905) (3,898)
(Payments) proceeds from share-based compensation awards and other (586) 629
Net cash used by financing activities (4,599) (9,473)
Effect of exchange rate changes on cash (942) 455
Net decrease in cash and cash equivalents (21,239) (13,378)
Cash and cash equivalents at the beginning of period 97,679 38,277
Cash and cash equivalents at the end of period 76,440 24,899
Cash paid (received) for:    
Interest, net of amounts capitalized 145 232
Income taxes, net $ (3,742) $ 5,616