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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]      
Net sales $ 844,748 $ 879,577 $ 839,055
Income from operations 67,620 66,528 62,664
Identifiable assets 552,776 603,503  
Non-US      
Segment Reporting Information [Line Items]      
Net sales 232,291 243,108 260,874
Income from operations 18,544 9,682 15,840
Income before income taxes 18,720 15,840 17,315
Identifiable assets $ 167,990 $ 194,839 $ 219,036