Segment Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) segment	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment			3
Segment Information
Net sales	$ 216,139	$ 209,320	$ 609,295	$ 585,518
Income (Loss) from Operations	35,249	32,218	86,535	83,956
Total Assets	960,046	981,843	960,046	981,843	$ 973,065
Cash and cash equivalent	242,795	258,238	242,795	258,238	260,307	$ 251,208
Intersegment elimination
Segment Information
Net sales	6,553	7,256	19,212	17,303
Administrative and all other
Segment Information
Income (Loss) from Operations	(801)	(995)	(4,753)	(3,142)
Total Assets	27,919	77,285	27,919	77,285	83,664
Cash and cash equivalent	153,800	166,800	153,800	166,800	167,400
North America
Segment Information
Net sales	184,515	171,064	518,221	476,546
Income (Loss) from Operations	33,432	29,914	89,148	82,598
Total Assets	730,333	684,820	730,333	684,820	679,844
North America | Intersegment elimination
Segment Information
Net sales	680	1,058	2,284	3,151
Europe
Segment Information
Net sales	29,728	34,609	83,143	97,297
Income (Loss) from Operations	3,563	3,447	5,259	6,283
Total Assets	176,208	190,359	176,208	190,359	180,005
Europe | Intersegment elimination
Segment Information
Net sales	250	308	641	934
Asia/Pacific
Segment Information
Net sales	1,896	3,647	7,931	11,675
Income (Loss) from Operations	(945)	(148)	(3,119)	(1,783)
Total Assets	25,586	29,379	25,586	29,379	$ 29,552
Asia/Pacific | Intersegment elimination
Segment Information
Net sales	$ 5,623	$ 5,890	$ 16,287	$ 13,218