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Guarantor Financial Statements (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Condensed Consolidating Statements of Income and Comprehensive Income    
Net sales $ 405,189 $ 397,352
Energy and related sales, net 1,101 1,861
Total revenues 406,290 399,213
Costs of products sold 348,915 338,243
Gross profit 57,375 60,970
Selling, general and administrative expenses 33,487 29,967
Gains on dispositions of plant, equipment and timberlands, net (73) (37)
Operating income 23,961 31,040
Other non-operating income (expense)    
Interest expense (3,841) (4,269)
Interest income 102 123
Other, net 247 196
Total other non-operating income (expense) (3,492) (3,950)
Income (loss) before income taxes 20,469 27,090
Income tax provision (benefit) 4,840 8,212
Net income (loss) 15,629 18,878
Other comprehensive income (7,689) 11,651
Comprehensive income 7,940 30,529
Parent Company [Member]
    
Condensed Consolidating Statements of Income and Comprehensive Income    
Net sales 227,116 223,802
Energy and related sales, net 1,101 1,861
Total revenues 228,217 225,663
Costs of products sold 200,469 192,876
Gross profit 27,748 32,787
Selling, general and administrative expenses 20,602 17,036
Gains on dispositions of plant, equipment and timberlands, net    (26)
Operating income 7,146 15,777
Other non-operating income (expense)    
Interest expense (3,841) (4,305)
Interest income (760) (650)
Other, net 12,934 11,189
Total other non-operating income (expense) 8,333 6,234
Income (loss) before income taxes 15,479 22,011
Income tax provision (benefit) (150) 3,133
Net income (loss) 15,629 18,878
Other comprehensive income (7,689) 11,651
Comprehensive income 7,940 30,529
Guarantors [Member]
    
Condensed Consolidating Statements of Income and Comprehensive Income    
Net sales 15,016 15,370
Energy and related sales, net     
Total revenues 15,016 15,370
Costs of products sold 13,407 13,948
Gross profit 1,609 1,422
Selling, general and administrative expenses 540 739
Gains on dispositions of plant, equipment and timberlands, net (73)  
Operating income 1,142 683
Other non-operating income (expense)    
Interest expense      
Interest income 1,658 1,642
Other, net 60 89
Total other non-operating income (expense) 1,718 1,731
Income (loss) before income taxes 2,860 2,414
Income tax provision (benefit) 772 1,093
Net income (loss) 2,088 1,321
Other comprehensive income (4,608)  
Comprehensive income (2,520) 1,321
Non Guarantors [Member]
    
Condensed Consolidating Statements of Income and Comprehensive Income    
Net sales 178,072 173,561
Energy and related sales, net     
Total revenues 178,072 173,561
Costs of products sold 149,968 146,742
Gross profit 28,104 26,819
Selling, general and administrative expenses 12,345 12,192
Gains on dispositions of plant, equipment and timberlands, net    (11)
Operating income 15,759 14,638
Other non-operating income (expense)    
Interest expense    36
Interest income (796) (869)
Other, net 740 473
Total other non-operating income (expense) (56) (360)
Income (loss) before income taxes 15,703 14,278
Income tax provision (benefit) 4,255 4,011
Net income (loss) 11,448 10,267
Other comprehensive income (7,978) 8,634
Comprehensive income 3,470 18,901
Adjustments/ Eliminations [Member]
    
Condensed Consolidating Statements of Income and Comprehensive Income    
Net sales (15,015) (15,381)
Energy and related sales, net     
Total revenues (15,015) (15,381)
Costs of products sold (14,929) (15,323)
Gross profit (86) (58)
Selling, general and administrative expenses     
Gains on dispositions of plant, equipment and timberlands, net     
Operating income (86) (58)
Other non-operating income (expense)    
Interest expense     
Interest income      
Other, net (13,487) (11,555)
Total other non-operating income (expense) (13,487) (11,555)
Income (loss) before income taxes (13,573) (11,613)
Income tax provision (benefit) (37) (25)
Net income (loss) (13,536) (11,588)
Other comprehensive income 12,586 (8,634)
Comprehensive income $ (950) $ (20,222)