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International Operations and Geographic Information (Schedule of Selected Financial Information for International Operations) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Net sales $ 1,008,822 $ 912,380 $ 844,748
Income from operations 101,088 88,738 67,620
Identifiable assets 721,633 639,671  
Non-US      
Segment Reporting Information [Line Items]      
Net sales 297,246 254,144 232,291
Income from operations 28,301 23,110 18,544
Income before income taxes 29,254 22,476 18,720
Identifiable assets $ 244,888 $ 227,758 $ 167,990