Segment Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) segment	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment			3
Segment Information
Net sales	$ 309,932	$ 284,178	$ 874,029	$ 836,964
Income (Loss) from Operations	60,967	59,678	144,643	153,794
Total Assets	1,086,308	1,094,613	1,086,308	1,094,613	$ 1,021,663
Cash and cash equivalent	194,061	166,961	194,061	166,961	160,180	$ 168,514
Intersegment elimination
Segment Information
Net sales	8,599	8,409	24,167	23,536
Administrative and all other
Segment Information
Income (Loss) from Operations	(782)	(469)	(3,654)	(3,234)
Total Assets	(357,501)	(223,633)	(357,501)	(223,633)	(280,430)
Cash and cash equivalent	135,900	87,500	135,900	87,500	113,600
North America
Segment Information
Net sales	265,505	239,898	746,009	705,932
Income (Loss) from Operations	56,844	56,280	139,489	152,724
Total Assets	1,246,617	1,080,910	1,246,617	1,080,910	1,119,012
North America | Intersegment elimination
Segment Information
Net sales	520	683	1,327	1,889
Europe
Segment Information
Net sales	42,219	42,020	121,647	124,096
Income (Loss) from Operations	5,386	3,953	9,645	6,053
Total Assets	169,183	208,888	169,183	208,888	157,437
Europe | Intersegment elimination
Segment Information
Net sales	479	140	1,568	740
Asia/Pacific
Segment Information
Net sales	2,208	2,260	6,373	6,936
Income (Loss) from Operations	(481)	(86)	(837)	(1,749)
Total Assets	28,009	28,448	28,009	28,448	$ 25,644
Asia/Pacific | Intersegment elimination
Segment Information
Net sales	$ 7,600	$ 7,586	$ 21,272	$ 20,907