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