Business Segment and Geographic Information (Operations by Geographic Area) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Net sales	[1]	$ 641,443	$ 610,911	$ 537,482
Long-Lived Assets	[2]	428,827	287,223	304,772
United States
Segment Reporting Information [Line Items]
Net sales	[1]	162,662	124,305	118,217
Long-Lived Assets	[2]	217,595	70,728	64,744
China
Segment Reporting Information [Line Items]
Net sales	[1]	192,155	236,488	193,734
Long-Lived Assets	[2]	65,994	49,794	44,805
Germany
Segment Reporting Information [Line Items]
Net sales	[1]	81,452	93,478	79,043
Long-Lived Assets	[2]	110,240	129,702	154,688
Other
Segment Reporting Information [Line Items]
Net sales	[1]	205,174	156,640	146,488
Long-Lived Assets	[2]	$ 34,998	$ 36,999	$ 40,535

[1] Net sales are allocated to countries based on the location of the customer.

[2] Long-lived assets are based on the location of the asset and are comprised of goodwill and other intangibles and property, plant and equipment.