Property, Plant and Equiptment (Schedule of Plant Property and Equiptment) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Abstract]
Land	$ 15,394	$ 15,453
Buildings and Improvements, Gross	132,673	132,739
Machinery and Equipment, Gross	151,023	153,076
Furniture and Fixtures, Gross	34,300	26,825
Equipment in process	21,202	13,810
Property, Plant and Equipment, Gross	354,592	341,903
Property, plant and equipment, accumulated depreciation	(205,575)	(193,721)
Property, Plant and Equipment, Net	$ 149,017	$ 148,182