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Business Segments (Schedule Of Net Sales By Geographic Area) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net Sales by Geographic Area, Total | $ 930,721 | [1],[2] | $ 857,342 | [1],[2] | $ 775,932 | [1],[2]
United States |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net Sales by Geographic Area, Total | 534,346 | [1] | 480,041 | [1] | 462,479 | [1]
Exports From The United States | Asia |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net Sales by Geographic Area, Total | 82,235 | [1] | 57,639 | [1] | 56,050 | [1]
Exports From The United States | Canada |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net Sales by Geographic Area, Total | 46,481 | [1] | 46,948 | [1] | 49,428 | [1]
Exports From The United States | Europe |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net Sales by Geographic Area, Total | 6,984 | [1] | 5,186 | [1] | 6,171 | [1]
Exports From The United States | Latin America |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net Sales by Geographic Area, Total | 3,505 | [1] | 3,145 | [1] | 4,413 | [1]
Operations Outside The United States | Brazil |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net Sales by Geographic Area, Total | 109,415 | [1] | 121,373 | [1] | 43,528 | [1]
Operations Outside The United States | The Netherlands |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net Sales by Geographic Area, Total | 68,471 | [1] | 67,758 | [1] | 80,509 | [1]
Operations Outside The United States | Hungary |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net Sales by Geographic Area, Total | 43,482 | [1] | 41,285 | [1] | 33,824 | [1]
Operations Outside The United States | China |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net Sales by Geographic Area, Total | 28,702 | [1] | 30,636 | [1] | 32,740 | [1]
Operations Outside The United States | India |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net Sales by Geographic Area, Total | 7,100 | [1] | 3,331 | [1] |  | [1]
Operations Outside The United States | Italy |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net Sales by Geographic Area, Total |  | [1] | $ 0 | [1] | $ 6,790 | [1]
[1] | Information on exports and foreign operations are provided on the next page. Cash and cash equivalents includes funds held in locations outside the U.S. of $38.6 million and $28.6 million at December 31, 2013 and 2012, respectively. Export sales relate almost entirely to Film Products. Operations outside the U.S. in The Netherlands, Hungary, China, Italy (sold in 2011), Brazil and India also relate to Film Products. Sales from our locations in The Netherlands, Hungary and Italy are primarily to customers located in Europe. Sales from our locations in China (Guangzhou and Shanghai) are primarily to customers located in China, but also include other customers in Asia. Sales activity at the new film products manufacturing facility in India was not significant in 2011.
[2] | The difference between total consolidated sales as reported in the consolidated statements of income and segment and geographic net sales reported in this note is freight of $28.6 million in 2013, $24.8 million in 2012 and $18.5 million in 2011.

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- Definition Aggregrate revenue during the period from the sales of goods in the normal course of business, after deducting returns, allowances, discounts, and charges for outbound freight. + References No definition available. + Details
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