Segments and Geographic Information (Sales and Long-Lived Assets by Geographic Area) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 801,093	$ 785,156
Long-lived assets	264,960	265,675
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	99,135	89,838
Mexico
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	86,775	87,836
All Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	79,050	88,001
Product
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	797,858	781,828
Product | United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	480,868	479,018
Product | Mexico
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	101,656	93,370
Product | All Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 215,334	$ 209,440