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Consolidating Financial Information (Consolidating Balance Sheets) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
ASSETS        
Cash and cash equivalents $ 64,013 $ 89,129 $ 72,746 $ 50,370
Trade and other accounts receivable, net 331,155 297,055    
Amounts due from affiliated companies 0 0    
Inventories 321,339 322,674    
Deferred income taxes 7,451 8,452    
Prepaid expenses and other current assets 34,256 18,185    
Total current assets 758,214 735,495    
Amounts due from affiliated companies 0 0    
Property, plant, and equipment, at cost 1,078,658 1,070,967    
Less accumulated depreciation and amortization 718,064 712,596    
Net property, plant, and equipment 360,594 358,371    
Investment in consolidated subsidiaries 0 0    
Prepaid pension cost 12,800 12,710    
Deferred income taxes 53,960 55,123    
Other assets and deferred charges 67,443 72,007    
Intangibles (net of amortization) and goodwill 28,378 30,542    
Total assets 1,281,389 1,264,248    
LIABILITIES AND SHAREHOLDERS’ EQUITY        
Accounts payable 115,675 119,298    
Accrued expenses 65,549 79,061    
Dividends payable 10,282 0    
Book overdraft 5,149 3,906    
Amounts due to affiliated companies 0 0    
Long-term debt, current portion 5,193 4,382    
Income taxes payable 25,294 10,024    
Total current liabilities 227,142 216,671    
Long-term debt 425,422 424,407    
Amounts due to affiliated companies 0 0    
Other noncurrent liabilities 210,256 220,965    
Total liabilities 862,820 862,043    
Shareholders’ equity:        
Common stock and paid-in capital 0 721    
Accumulated other comprehensive loss (127,381) (110,689)   (98,732)
Retained earnings 545,950 512,173    
Total shareholders' equity 418,569 402,205   549,593
Total liabilities and shareholders’ equity 1,281,389 1,264,248    
Parent Company [Member]
        
ASSETS        
Cash and cash equivalents 3 5,001 17 17
Trade and other accounts receivable, net 3,562 4,346    
Amounts due from affiliated companies 21,824 0    
Inventories 0 0    
Deferred income taxes 2,079 2,555    
Prepaid expenses and other current assets 10,591 66    
Total current assets 38,059 11,968    
Amounts due from affiliated companies 55,928 58,935    
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 862,545 895,029    
Prepaid pension cost 0 0    
Deferred income taxes 51,155 53,087    
Other assets and deferred charges 42,285 46,286    
Intangibles (net of amortization) and goodwill 0 0    
Total assets 1,049,972 1,065,305    
LIABILITIES AND SHAREHOLDERS’ EQUITY        
Accounts payable 25 206    
Accrued expenses 10,579 8,367    
Dividends payable 10,282      
Book overdraft 0 0    
Amounts due to affiliated companies 45,626 91,403    
Long-term debt, current portion 0 0    
Income taxes payable 4,955 0    
Total current liabilities 71,467 99,976    
Long-term debt 425,422 424,407    
Amounts due to affiliated companies 0 0    
Other noncurrent liabilities 134,514 138,717    
Total liabilities 631,403 663,100    
Shareholders’ equity:        
Common stock and paid-in capital 0 721    
Accumulated other comprehensive loss (127,381) (110,689)    
Retained earnings 545,950 512,173    
Total shareholders' equity 418,569 402,205    
Total liabilities and shareholders’ equity 1,049,972 1,065,305    
Guarantor Subsidiaries [Member]
        
ASSETS        
Cash and cash equivalents 4,141 7,202 27,295 9,653
Trade and other accounts receivable, net 121,399 116,865    
Amounts due from affiliated companies 78,413 142,277    
Inventories 124,731 125,171    
Deferred income taxes 4,690 5,204    
Prepaid expenses and other current assets 21,447 16,253    
Total current assets 354,821 412,972    
Amounts due from affiliated companies 111,833 56,326    
Property, plant, and equipment, at cost 840,821 833,352    
Less accumulated depreciation and amortization 584,102 578,183    
Net property, plant, and equipment 256,719 255,169    
Investment in consolidated subsidiaries 0 0    
Prepaid pension cost 0 0    
Deferred income taxes 0 0    
Other assets and deferred charges 23,863 23,670    
Intangibles (net of amortization) and goodwill 22,031 23,784    
Total assets 769,267 771,921    
LIABILITIES AND SHAREHOLDERS’ EQUITY        
Accounts payable 72,851 75,483    
Accrued expenses 37,399 51,577    
Dividends payable 0      
Book overdraft 5,149 3,906    
Amounts due to affiliated companies 46,097 55,437    
Long-term debt, current portion 0 0    
Income taxes payable 5,789 55    
Total current liabilities 167,285 186,458    
Long-term debt 0 0    
Amounts due to affiliated companies 63,954 8,024    
Other noncurrent liabilities 41,706 49,280    
Total liabilities 272,945 243,762    
Shareholders’ equity:        
Common stock and paid-in capital 388,282 388,282    
Accumulated other comprehensive loss (22,281) (18,767)    
Retained earnings 130,321 158,644    
Total shareholders' equity 496,322 528,159    
Total liabilities and shareholders’ equity 769,267 771,921    
Non-Guarantor Subsidiaries [Member]
        
ASSETS        
Cash and cash equivalents 59,869 76,926 45,434 40,700
Trade and other accounts receivable, net 206,194 175,844    
Amounts due from affiliated companies 16,809 33,282    
Inventories 196,608 197,503    
Deferred income taxes 682 693    
Prepaid expenses and other current assets 2,218 1,866    
Total current assets 482,380 486,114    
Amounts due from affiliated companies 0 0    
Property, plant, and equipment, at cost 237,837 237,615    
Less accumulated depreciation and amortization 133,962 134,413    
Net property, plant, and equipment 103,875 103,202    
Investment in consolidated subsidiaries 0 0    
Prepaid pension cost 12,800 12,710    
Deferred income taxes 6,909 8,451    
Other assets and deferred charges 1,295 2,051    
Intangibles (net of amortization) and goodwill 6,347 6,758    
Total assets 613,606 619,286    
LIABILITIES AND SHAREHOLDERS’ EQUITY        
Accounts payable 42,799 43,609    
Accrued expenses 17,571 19,117    
Dividends payable 0      
Book overdraft 0 0    
Amounts due to affiliated companies 25,323 28,719    
Long-term debt, current portion 5,193 4,382    
Income taxes payable 14,550 9,969    
Total current liabilities 105,436 105,796    
Long-term debt 0 0    
Amounts due to affiliated companies 103,807 107,237    
Other noncurrent liabilities 38,140 39,383    
Total liabilities 247,383 252,416    
Shareholders’ equity:        
Common stock and paid-in capital 71,322 71,322    
Accumulated other comprehensive loss (50,056) (36,055)    
Retained earnings 344,957 331,603    
Total shareholders' equity 366,223 366,870    
Total liabilities and shareholders’ equity 613,606 619,286    
Total Consolidating Adjustments [Member]
        
ASSETS        
Cash and cash equivalents 0 0 0 0
Trade and other accounts receivable, net 0 0    
Amounts due from affiliated companies (117,046) (175,559)    
Inventories 0 0    
Deferred income taxes 0 0    
Prepaid expenses and other current assets 0 0    
Total current assets (117,046) (175,559)    
Amounts due from affiliated companies (167,761) (115,261)    
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 (862,545) (895,029)    
Prepaid pension cost 0 0    
Deferred income taxes (4,104) (6,415)    
Other assets and deferred charges 0 0    
Intangibles (net of amortization) and goodwill 0 0    
Total assets (1,151,456) (1,192,264)    
LIABILITIES AND SHAREHOLDERS’ EQUITY        
Accounts payable 0 0    
Accrued expenses 0 0    
Dividends payable 0      
Book overdraft 0 0    
Amounts due to affiliated companies (117,046) (175,559)    
Long-term debt, current portion 0 0    
Income taxes payable 0 0    
Total current liabilities (117,046) (175,559)    
Long-term debt 0 0    
Amounts due to affiliated companies (167,761) (115,261)    
Other noncurrent liabilities (4,104) (6,415)    
Total liabilities (288,911) (297,235)    
Shareholders’ equity:        
Common stock and paid-in capital (459,604) (459,604)    
Accumulated other comprehensive loss 72,337 54,822    
Retained earnings (475,278) (490,247)    
Total shareholders' equity (862,545) (895,029)    
Total liabilities and shareholders’ equity $ (1,151,456) $ (1,192,264)