Geographic and Segment Information (Geographic Areas) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($) geographic_region	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) geographic_region	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of geographic regions in which entity operates \| geographic_region	3		3
Net sales	$ 309,664	$ 295,268	$ 916,156	$ 903,284
Property, plant and equipment, net	213,769		213,769		$ 223,842
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	122,208	123,810	366,115	362,358
Property, plant and equipment, net	62,630		62,630		61,279
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	92,953	91,245	294,338	301,727
Property, plant and equipment, net	137,682		137,682		130,777
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	9,600	8,800	26,800	27,900
France
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	29,600	28,900	96,600	95,900
Rest of World
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	94,503	$ 80,213	255,703	$ 239,199
Property, plant and equipment, net	$ 13,457		$ 13,457		$ 31,786