Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment
Property, Plant and Equipment, Gross	$ 1,233,188	$ 1,177,378
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(515,662)	(509,107)
Total Property, Plant and Equipment, Net	717,526	668,271
Land [Member]
Property, Plant and Equipment
Property, Plant and Equipment, Gross	58,072	58,046
Building and Building Improvements [Member]
Property, Plant and Equipment
Property, Plant and Equipment, Gross	317,636	300,850
Machinery and Equipment [Member]
Property, Plant and Equipment
Property, Plant and Equipment, Gross	386,504	382,233
Computer Software, Intangible Asset [Member]
Property, Plant and Equipment
Property, Plant and Equipment, Gross	$ 470,976	$ 436,249