Property, Plant and Equipment, Net (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment
Property, Plant and Equipment, Gross	$ 934,772	$ 933,150
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(423,310)	(418,712)
Total Property, Plant and Equipment, Net	511,462	514,438
Land [Member]
Property, Plant and Equipment
Property, Plant and Equipment, Gross	51,123	56,214
Building and Building Improvements [Member]
Property, Plant and Equipment
Property, Plant and Equipment, Gross	210,008	212,277
Machinery and Equipment [Member]
Property, Plant and Equipment
Property, Plant and Equipment, Gross	345,888	361,978
Computer Software, Intangible Asset [Member]
Property, Plant and Equipment
Property, Plant and Equipment, Gross	$ 327,753	$ 302,681