Property and Equipment, Net (Schedule of Property and Equipment, Net) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Property and Equipment [Line Items]
Property and equipment	$ 1,981,600	$ 1,923,500
Less accumulated depreciation and amortization	(1,044,300)	(1,017,700)
Property and equipment, net	937,309	905,835
Land [Member]
Property and Equipment [Line Items]
Property and equipment	4,900	4,900
Building and Leasehold Improvements [Member]
Property and Equipment [Line Items]
Property and equipment	36,900	35,800
Machinery and Equipment [Member]
Property and Equipment [Line Items]
Property and equipment	1,670,300	1,659,400
Office Furniture and Equipment [Member]
Property and Equipment [Line Items]
Property and equipment	205,900	197,300
Construction in Progress [Member]
Property and Equipment [Line Items]
Property and equipment	$ 63,600	$ 26,100