Property and Equipment, Net (Schedule of Property and Equipment, Net) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Property and Equipment [Line Items]
Property and equipment	$ 1,103,900	$ 1,086,900
Less accumulated depreciation and amortization	(555,900)	(528,200)
Property and equipment, net	547,957	558,667
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	21,900	21,700
Machinery and Equipment [Member]
Property and Equipment [Line Items]
Property and equipment	923,400	912,900
Office Furniture and Equipment [Member]
Property and Equipment [Line Items]
Property and equipment	140,300	136,900
Construction in Progress [Member]
Property and Equipment [Line Items]
Property and equipment	$ 13,700	$ 10,800