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Property and Equipment, Net (Schedule of Property and Equipment, Net) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Property and Equipment [Line Items]    
Property and equipment $ 2,275,500 $ 2,169,700
Less accumulated depreciation and amortization (1,251,000) (1,187,400)
Property and equipment, net 1,024,509 982,328
Land [Member]    
Property and Equipment [Line Items]    
Property and equipment 8,400 6,000
Building and Leasehold Improvements [Member]    
Property and Equipment [Line Items]    
Property and equipment 43,700 40,500
Machinery and Equipment [Member]    
Property and Equipment [Line Items]    
Property and equipment 1,972,100 1,875,500
Office Furniture and Equipment [Member]    
Property and Equipment [Line Items]    
Property and equipment 228,300 221,600
Construction in Progress [Member]    
Property and Equipment [Line Items]    
Property and equipment $ 23,000 $ 26,100