Property and Equipment, Net (Schedule of Property and Equipment, Net) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Property and Equipment [Line Items]
Property and equipment	$ 1,536,000	$ 1,455,600
Less accumulated depreciation and amortization	(796,600)	(749,100)
Property and equipment, net	739,425	706,506
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	28,400	26,700
Machinery and Equipment [Member]
Property and Equipment [Line Items]
Property and equipment	1,319,500	1,261,900
Office Furniture and Equipment [Member]
Property and Equipment [Line Items]
Property and equipment	157,300	149,900
Construction in Progress [Member]
Property and Equipment [Line Items]
Property and equipment	$ 26,200	$ 12,500

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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