Property and Equipment, Net (Schedule of Property and Equipment, Net) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Property and Equipment [Line Items]
Property and equipment	$ 1,789,100	$ 1,613,500
Less accumulated depreciation and amortization	(936,300)	(865,700)
Property and equipment, net	852,804	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	34,100	30,300
Machinery and Equipment [Member]
Property and Equipment [Line Items]
Property and equipment	1,545,400	1,391,800
Office Furniture and Equipment [Member]
Property and Equipment [Line Items]
Property and equipment	174,800	166,700
Construction in Progress [Member]
Property and Equipment [Line Items]
Property and equipment	$ 30,200	$ 20,100