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 ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]      
Impairment of Long-Lived Assets Held-for-use $ 2,072,000 $ 1,401,000 $ 4,310,000
Property, plant, and equipment, gross 780,950,000 737,205,000  
Less accumulated depreciation (489,354,000) (455,811,000)  
Property, plant, and equipment, net 291,596,000 281,394,000  
Land and Land Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant, and equipment, gross 20,961,000 21,065,000  
Building and Building Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant, and equipment, gross 170,928,000 173,919,000  
Machinery and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant, and equipment, gross 327,678,000 322,032,000  
Furniture and Fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant, and equipment, gross 88,305,000 83,613,000  
Leasehold Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant, and equipment, gross 131,756,000 121,949,000  
Construction in Progress [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant, and equipment, gross $ 41,322,000 $ 14,627,000