Property, Plant and Equipment (Textuals) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Depreciation	$ 101,700,000	$ 94,300,000	$ 88,100,000
Capitalized leases	0	0
Capitalized interest	900,000	$ 2,700,000	3,600,000
2018 Restructuring Plan [Member]
Property, Plant and Equipment [Line Items]
Asset impairment charges, patent and equipment	$ 2,200,000
2016 Restructuring Plan [Member] [Member]
Property, Plant and Equipment [Line Items]
Asset impairment charges, patent and equipment			$ 4,500,000