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International Operations and Geographic Information (Schedule of Selected Financial Information for International Operations) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Segment Reporting Information [Line Items]      
Net sales $ 628,402 $ 603,593 $ 538,548
Income from operations 45,349 49,456 30,873
Identifiable assets 404,339 381,665 370,983
Other
     
Segment Reporting Information [Line Items]      
Net sales 227,568 216,201 193,182
Income from operations 14,470 19,362 13,476
Income before income taxes 13,731 20,051 13,429
Identifiable assets $ 179,263 $ 155,188 $ 160,966