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International Operations and Geographic Information (Schedule of International Operations) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]      
Net sales $ 1,119,138 $ 1,008,822 $ 912,380
Income from operations 94,648 101,088 88,738
Identifiable assets 1,212,763 721,633  
Non-US      
Segment Reporting Information [Line Items]      
Net sales 357,602 297,246 254,144
Income from operations 32,518 28,301 23,110
Income before income taxes 31,975 29,254 22,476
Identifiable assets $ 333,392 $ 244,888 $ 227,758