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Summary Of Significant Accounting Policies (Narrative) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2011 A | Dec. 31, 2010 | Dec. 31, 2009
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of joint ventures accounted for under equity method | 1 |  |
Customer returns, allowances and earned discounts as a percentage of gross selling price | 1.00% |  |
Reserve for customer accounts receivable, percentage | 1.00% |  |
Allowance for doubtful accounts | $ 1,900,000 | $ 2,500,000 |
Reserve for customer deductions | 3,100,000 | 2,900,000 |
Inventories valued using the LIFO method, amount | 197,300,000 | 199,500,000 |
Inventory values before LIFO inventory reserve | 324,031,000 | 309,226,000 |
Interest capitalization, construction in progress | 7,100,000 | 4,800,000 | 900,000
Depreciation expense | 161,500,000 | 154,000,000 | 148,200,000
Amortization period of customer lists and relationships, minimum, in years | 6 |  |
Amortization period of customer lists and relationships, maximum, in years | 40 |  |
Goodwill | 58,214,000 | 38,854,000 |
Unamortized deferred financing costs | 2,600,000 | 1,300,000 |
Area leased under timberland cutting rights (acres) | 88,000 |  |
Long-term lease costs capitalization | 26,200,000 | 24,500,000 |
Depletion expense | 40,000 | 500,000 | 1,200,000
Net capitalized software costs | 1,900,000 | 1,500,000 |
Software amortization expense | 600,000 | 600,000 | 500,000
Research and development costs | 12,500,000 | 10,900,000 | 9,400,000
Interest income included in net interest expense | 20,000 | 40,000 | 100,000
Amortization of the net gain on treasury lock settlements | $ (1,846,000) | $ (1,846,000) | $ (1,846,000)
Percent of net sales threshold used to determine major customers | 10.00% |  |
Minimum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Term of senior credit facilities and notes, in years | 5 |  |
Maximum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Term of senior credit facilities and notes, in years | 10 |  |

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