Property, Plant, and Equipment, Net (Schedule of Property, Plant, and Equipment, Net) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 737,205	$ 688,326
Less accumulated depreciation	(455,811)	(408,676)
Property, plant, and equipment, net	281,394	279,650
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	21,065	20,862
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	173,919	165,746
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	322,032	301,566
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	83,613	79,103
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	121,949	107,574
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 14,627	$ 13,475