Property, Plant and Equipment Property, Plant and Equipment (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Land and Land Improvements	$ 17,201,000	$ 16,448,000
Buildings and structures	33,985,000	32,908,000
Machinery and Equipment	171,385,000	165,369,000
Construction in Progress	1,225,000	3,188,000
Property, Plant and Equipment, Gross	223,796,000	217,913,000
Accumulated Depreciation	(163,820,000)	(159,863,000)
Property, Plant and Equipment, Net	59,976,000	58,050,000
Depreciation	$ 8,200,000	$ 8,800,000	$ 9,800,000