Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) segment	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment			3
Segment Information
Net sales	$ 216,665	$ 207,910	$ 393,156	$ 376,198
Income (Loss) from Operations	35,009	32,133	51,286	51,738
Total Assets	995,857	983,334	995,857	983,334	$ 973,065
Cash and cash equivalent	248,612	221,196	248,612	221,196	260,307	$ 251,208
Intersegment elimination
Segment Information
Net sales	6,632	5,379	12,659	10,047
Administrative and all other
Segment Information
Income (Loss) from Operations	(2,197)	(1,261)	(3,951)	(2,147)
Total Assets	74,891	88,589	74,891	88,589	83,664
Cash and cash equivalent	165,000	131,600	165,000	131,600	167,400
North America
Segment Information
Net sales	183,381	168,600	333,705	305,482
Income (Loss) from Operations	35,249	30,123	55,715	52,685
Total Assets	716,222	659,307	716,222	659,307	679,844
North America | Intersegment elimination
Segment Information
Net sales	720	963	1,604	2,093
Europe
Segment Information
Net sales	30,627	35,041	53,414	62,688
Income (Loss) from Operations	3,328	3,755	1,696	2,836
Total Assets	177,227	205,570	177,227	205,570	180,005
Europe | Intersegment elimination
Segment Information
Net sales	92	160	391	626
Asia/Pacific
Segment Information
Net sales	2,657	4,269	6,037	8,028
Income (Loss) from Operations	(1,371)	(484)	(2,174)	(1,636)
Total Assets	27,517	29,868	27,517	29,868	$ 29,552
Asia/Pacific | Intersegment elimination
Segment Information
Net sales	$ 5,820	$ 4,256	$ 10,664	$ 7,328