Segment Information (Net Sales by Region or Origin and Long-Lived Assets by Region of Domicile) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 862,087	$ 827,567	$ 790,058
Long-lived assets:	135,470	138,617	157,704
North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	816,473	784,926	741,675
Long-lived assets:	126,513	130,407	150,255
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	45,614	42,641	48,383
Long-lived assets:	$ 8,957	$ 8,210	$ 7,449