Property and Equipment, Net (Schedule of Property and Equipment, Net) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Property and Equipment [Line Items]
Property and equipment	$ 1,426,100	$ 1,182,200
Less accumulated depreciation and amortization	(734,700)	(633,100)
Property and equipment, net	691,430	549,084
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	25,700	24,200
Machinery and Equipment [Member]
Property and Equipment [Line Items]
Property and equipment	1,237,300	997,800
Office Furniture and Equipment [Member]
Property and Equipment [Line Items]
Property and equipment	149,600	146,100
Construction in Progress [Member]
Property and Equipment [Line Items]
Property and equipment	$ 8,900	$ 9,500