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International Operations and Geographic Information (Schedule of International Operations) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Net sales $ 1,163,466 $ 1,119,138 $ 1,008,822
Income from operations 93,165 94,648 101,088
Identifiable assets 1,109,329 1,212,763  
Non-US      
Segment Reporting Information [Line Items]      
Net sales 312,462 357,602 297,246
Income from operations 31,166 32,518 28,301
Income before income taxes 30,674 31,975 29,254
Identifiable assets $ 304,536 $ 333,392 $ 244,888