Property, Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 686,537	$ 634,464
Less accumulated depreciation	(383,979)	(401,367)
Property, plant and equipment, net	302,558	233,097
Depreciation expense	34,419	34,218	36,772
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	21,935	15,260
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	154,938	127,117
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 509,664	$ 492,087