Property and Equipment, Net (Schedule of Property and Equipment, Net) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Property and Equipment [Line Items]
Property and equipment	$ 1,836,800	$ 1,613,500
Less accumulated depreciation and amortization	(973,900)	(865,700)
Property and equipment, net	862,923	747,808
Land [Member]
Property and Equipment [Line Items]
Property and equipment	4,600	4,600
Building and Leasehold Improvements [Member]
Property and Equipment [Line Items]
Property and equipment	35,000	30,300
Machinery and Equipment [Member]
Property and Equipment [Line Items]
Property and equipment	1,584,700	1,391,800
Office Furniture and Equipment [Member]
Property and Equipment [Line Items]
Property and equipment	181,300	166,700
Construction in Progress [Member]
Property and Equipment [Line Items]
Property and equipment	$ 31,200	$ 20,100