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, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Net sales	$ 676,836	$ 628,402	$ 603,593
Income from operations	50,737	45,349	49,456
Identifiable assets	438,476	404,339	381,665
Other
Segment Reporting Information [Line Items]
Net sales	236,839	227,568	216,201
Income from operations	14,822	14,470	19,362
Income before income taxes	16,241	13,731	20,051
Identifiable assets	$ 205,317	$ 179,263	$ 155,188