Property, Plant and Equipment, Net (Details) (USD $)				3 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Mar. 31, 2013 Facility closing	Dec. 31, 2012 Facility closing	Jun. 30, 2013 Land	Dec. 31, 2012 Land	Jun. 30, 2012 Land	Jun. 30, 2013 Buildings and site improvements	Dec. 31, 2012 Buildings and site improvements	Jun. 30, 2012 Buildings and site improvements	Jun. 30, 2013 Leasehold improvements	Dec. 31, 2012 Leasehold improvements	Jun. 30, 2012 Leasehold improvements	Jun. 30, 2013 Machinery and equipment	Dec. 31, 2012 Machinery and equipment	Jun. 30, 2012 Machinery and equipment
Property, Plant and Equipment
Property, plant and equipment, gross	$ 426,311,000	$ 425,224,000	$ 414,279,000			$ 30,390,000	$ 32,068,000	$ 32,100,000	$ 174,771,000	$ 174,187,000	$ 166,767,000	$ 4,996,000	$ 4,747,000	$ 4,852,000	$ 216,154,000	$ 214,222,000	$ 210,560,000
Accumulated depreciation and amortization	(226,202,000)	(217,868,000)	(210,431,000)
Property, plant and equipment excluding capital projects in progress, net	200,109,000	207,356,000	203,848,000
Capital projects in progress	9,435,000	6,096,000	4,837,000
Property, plant and equipment, net	209,544,000	213,452,000	208,685,000		2,800,000
Impairment loss on assets held and in use				$ 1,000,000