Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 segment	Jun. 30, 2013	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting [Abstract]
Number of reportable segments			3
Segment Information
Net sales	$ 207,893	$ 195,348	$ 376,198	$ 349,628
Income (Loss) from Operations	32,133	29,678	51,738	38,691
Total Assets	983,334	896,985	983,334	896,985	953,613
Cash and cash equivalent	221,196	165,275	221,196	165,275	251,208	175,553
Intersegment elimination
Segment Information
Net sales	5,379	6,439	10,047	11,616
Administrative and all other
Segment Information
Income (Loss) from Operations	(1,261)	(2,182)	(2,147)	(3,065)
Total Assets	88,589	72,033	88,589	72,033	93,473
Cash and cash equivalent	131,600	86,800	131,600	86,800	156,000
North America
Segment Information
Net sales	168,600	159,757	305,482	287,493
Income (Loss) from Operations	30,123	29,665	52,685	44,924
Total Assets	659,307	603,981	659,307	603,981	627,196
North America | Intersegment elimination
Segment Information
Net sales	963	1,170	2,093	1,931
Europe
Segment Information
Net sales	35,024	32,088	62,688	55,988
Income (Loss) from Operations	3,755	2,241	2,836	(1,939)
Total Assets	205,570	188,563	205,570	188,563	201,384
Europe | Intersegment elimination
Segment Information
Net sales	160	394	626	674
Asia/Pacific
Segment Information
Net sales	4,269	3,503	8,028	6,147
Income (Loss) from Operations	(484)	(46)	(1,636)	(1,229)
Total Assets	29,868	32,408	29,868	32,408	31,560
Asia/Pacific | Intersegment elimination
Segment Information
Net sales	$ 4,256	$ 4,875	$ 7,328	$ 9,011