International Operations and Geographic Information (Schedule of Selected Financial Information for International Operations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Net sales	$ 879,577	$ 839,055	$ 682,090
Income from operations	66,528	62,664	50,737
Identifiable assets	603,503	632,886
Other
Segment Reporting Information [Line Items]
Net sales	243,108	260,874	236,839
Income from operations	9,682	15,840	14,822
Income before income taxes	15,840	17,315	16,241
Identifiable assets	$ 194,839	$ 219,036	$ 205,317