Property, Plant and Equipment (Details) (USD $)							6 Months Ended				6 Months Ended				6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Land	Dec. 31, 2012 Land	Jun. 30, 2013 Building and improvements	Dec. 31, 2012 Building and improvements	Jun. 30, 2013 Building and improvements Minimum	Jun. 30, 2013 Building and improvements Maximum	Jun. 30, 2013 Machinery and equipment	Dec. 31, 2012 Machinery and equipment	Jun. 30, 2013 Machinery and equipment Minimum	Jun. 30, 2013 Machinery and equipment Maximum	Jun. 30, 2013 Computer equipment and software	Dec. 31, 2012 Computer equipment and software	Jun. 30, 2013 Computer equipment and software Minimum	Jun. 30, 2013 Computer equipment and software Maximum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 190,769,000	$ 189,406,000	$ 4,024,000	$ 4,024,000	$ 8,430,000	$ 9,654,000			$ 105,165,000	$ 103,064,000			$ 73,150,000	$ 72,664,000
Less: accumulated depreciation	(150,895,000)	(145,079,000)
Property, plant and equipment, net	39,874,000	44,327,000
Property, Plant and Equipment, Useful Life							21 years	30 years			2 years	10 years			3 years	5 years
Assets held for sale	$ 300,000