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Consolidating Financial Information (Consolidating Balance Sheets) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Cash and cash equivalents $ 50,370 $ 49,192 $ 151,831 $ 21,761
Short-term investments 0 300 300  
Trade and other accounts receivable, net 278,332 257,748    
Amounts due from affiliated companies 0 0    
Inventories 306,785 273,215    
Deferred income taxes 7,261 6,876    
Prepaid expenses and other current assets 36,983 15,444    
Total current assets 679,731 602,775    
Amounts due from affiliated companies 0 0    
Property, plant, and equipment, at cost 1,034,472 988,180    
Less accumulated depreciation and amortization 681,506 654,204    
Net property, plant, and equipment 352,966 333,976 302,415  
Investment in consolidated subsidiaries 0 0    
Prepaid pension cost 11,494 8,597 2,430  
Deferred income taxes 35,805 21,974    
Other assets and deferred charges 73,619 48,893    
Intangibles (net of amortization) and goodwill 38,047 46,526    
TOTAL ASSETS 1,191,662 1,062,741 1,025,192  
Accounts payable 103,217 109,250    
Accrued expenses 78,546 71,558    
Dividends payable 8,529 5,304    
Book overdraft 1,680 1,063    
Amounts due to affiliated companies 0 0    
Long-term debt, current portion 10,966 4,369    
Income taxes payable 13,086 14,843    
Total current liabilities 216,024 206,387    
Long-term debt 232,601 217,544    
Amounts due to affiliated companies 0 0    
Other noncurrent liabilities 193,444 147,170    
Total liabilities 642,069 571,101    
Common stock and paid in capital 64 0    
Accumulated other comprehensive loss (98,732) (73,820) (74,784) (95,750)
Retained earnings 648,261 565,460    
Total shareholders' equity 549,593 491,640 458,185 291,123
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY 1,191,662 1,062,741    
Parent Company [Member]
        
Cash and cash equivalents 17 17 40,008 0
Short-term investments   300    
Trade and other accounts receivable, net 0 4,264    
Amounts due from affiliated companies 732,392 0    
Inventories 0 0    
Deferred income taxes 2,790 2,805    
Prepaid expenses and other current assets 8,629 5,455    
Total current assets 743,828 12,841    
Amounts due from affiliated companies 0 0    
Property, plant, and equipment, at cost 0 0    
Less accumulated depreciation and amortization 0 0    
Net property, plant, and equipment 0 0    
Investment in consolidated subsidiaries 989,039 765,787    
Prepaid pension cost 0 0    
Deferred income taxes 43,053 33,142    
Other assets and deferred charges 42,219 28,157    
Intangibles (net of amortization) and goodwill 0 0    
TOTAL ASSETS 1,818,139 839,927    
Accounts payable 11 219    
Accrued expenses 8,093 11,253    
Dividends payable 8,529 5,304    
Book overdraft 0 0    
Amounts due to affiliated companies 944,282 88,850    
Long-term debt, current portion 0 0    
Income taxes payable 12,229 0    
Total current liabilities 973,144 105,626    
Long-term debt 172,000 154,000    
Amounts due to affiliated companies 0 0    
Other noncurrent liabilities 123,402 88,661    
Total liabilities 1,268,546 348,287    
Common stock and paid in capital 64 0    
Accumulated other comprehensive loss (98,732) (73,820)    
Retained earnings 648,261 565,460    
Total shareholders' equity 549,593 491,640    
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY 1,818,139 839,927    
Guarantor Subsidiaries [Member]
        
Cash and cash equivalents 9,653 7,717 62,203 4,408
Short-term investments   0    
Trade and other accounts receivable, net 122,812 102,158    
Amounts due from affiliated companies 1,057,075 135,736    
Inventories 106,278 95,383    
Deferred income taxes 3,836 3,332    
Prepaid expenses and other current assets 25,967 7,746    
Total current assets 1,325,621 352,072    
Amounts due from affiliated companies 110,444 57,470    
Property, plant, and equipment, at cost 815,209 787,721    
Less accumulated depreciation and amortization 558,177 535,241    
Net property, plant, and equipment 257,032 252,480    
Investment in consolidated subsidiaries 0 0    
Prepaid pension cost 0 660    
Deferred income taxes 0 0    
Other assets and deferred charges 29,166 19,052    
Intangibles (net of amortization) and goodwill 30,758 36,795    
TOTAL ASSETS 1,753,021 718,529    
Accounts payable 61,778 68,042    
Accrued expenses 50,827 41,535    
Dividends payable 0 0    
Book overdraft 1,680 1,063    
Amounts due to affiliated companies 818,452 0    
Long-term debt, current portion 2,943 2,875    
Income taxes payable 0 0    
Total current liabilities 935,680 113,515    
Long-term debt 60,601 63,544    
Amounts due to affiliated companies 8,025 0    
Other noncurrent liabilities 51,663 48,331    
Total liabilities 1,055,969 225,390    
Common stock and paid in capital 388,282 385,870    
Accumulated other comprehensive loss (20,355) (14,159)    
Retained earnings 329,125 121,428    
Total shareholders' equity 697,052 493,139    
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY 1,753,021 718,529    
Non-Guarantor Subsidiaries [Member]
        
Cash and cash equivalents 40,700 41,458 49,620 17,353
Short-term investments   0    
Trade and other accounts receivable, net 164,432 152,269    
Amounts due from affiliated companies 17,132 35,974    
Inventories 200,507 177,832    
Deferred income taxes 635 739    
Prepaid expenses and other current assets 2,387 2,243    
Total current assets 425,793 410,515    
Amounts due from affiliated companies 0 0    
Property, plant, and equipment, at cost 219,263 200,459    
Less accumulated depreciation and amortization 123,329 118,963    
Net property, plant, and equipment 95,934 81,496    
Investment in consolidated subsidiaries 0 0    
Prepaid pension cost 11,494 7,937    
Deferred income taxes 0 0    
Other assets and deferred charges 2,234 1,684    
Intangibles (net of amortization) and goodwill 7,289 9,731    
TOTAL ASSETS 542,744 511,363    
Accounts payable 41,428 40,989    
Accrued expenses 19,626 18,770    
Dividends payable 0 0    
Book overdraft 0 0    
Amounts due to affiliated companies 43,865 82,860    
Long-term debt, current portion 8,023 1,494    
Income taxes payable 9,769 15,786    
Total current liabilities 122,711 159,899    
Long-term debt 0 0    
Amounts due to affiliated companies 102,419 57,470    
Other noncurrent liabilities 25,627 21,346    
Total liabilities 250,757 238,715    
Common stock and paid in capital 71,322 73,734    
Accumulated other comprehensive loss (34,554) (35,900)    
Retained earnings 255,219 234,814    
Total shareholders' equity 291,987 272,648    
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY 542,744 511,363    
Total Consolidating Adjustments [Member]
        
Cash and cash equivalents 0 0 0 0
Short-term investments   0    
Trade and other accounts receivable, net (8,912) (943)    
Amounts due from affiliated companies (1,806,599) (171,710)    
Inventories 0 0    
Deferred income taxes 0 0    
Prepaid expenses and other current assets 0 0    
Total current assets (1,815,511) (172,653)    
Amounts due from affiliated companies (110,444) (57,470)    
Property, plant, and equipment, at cost 0 0    
Less accumulated depreciation and amortization 0 0    
Net property, plant, and equipment 0 0    
Investment in consolidated subsidiaries (989,039) (765,787)    
Prepaid pension cost 0 0    
Deferred income taxes (7,248) (11,168)    
Other assets and deferred charges 0 0    
Intangibles (net of amortization) and goodwill 0 0    
TOTAL ASSETS (2,922,242) (1,007,078)    
Accounts payable 0 0    
Accrued expenses 0 0    
Dividends payable 0 0    
Book overdraft 0 0    
Amounts due to affiliated companies (1,806,599) (171,710)    
Long-term debt, current portion 0 0    
Income taxes payable (8,912) (943)    
Total current liabilities (1,815,511) (172,653)    
Long-term debt 0 0    
Amounts due to affiliated companies (110,444) (57,470)    
Other noncurrent liabilities (7,248) (11,168)    
Total liabilities (1,933,203) (241,291)    
Common stock and paid in capital (459,604) (459,604)    
Accumulated other comprehensive loss 54,909 50,059    
Retained earnings (584,344) (356,242)    
Total shareholders' equity (989,039) (765,787)    
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY $ (2,922,242) $ (1,007,078)