Annual report pursuant to Section 13 and 15(d)

Property, Plant, and Equipment, Net (Schedule of Property, Plant, and Equipment, Net) (Details)

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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