Property, Plant And Equipment (Property, Plant And Equipment, At Depreciated Cost) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 years	Dec. 31, 2010 years
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 50,914	$ 48,967
Less: Accumulated depreciation	36,514	36,846
Property, plant and equipment, excluding construction in progress, net	14,400	12,121
Construction in progress	546	893
Total	14,946	13,014
Estimated Useful Life, minimum (in years)	3
Estimated Useful Life, maximum (in years)	10
Transportation Property And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	10,140	10,140
Estimated Useful Life, maximum (in years)	3	3
Machinery And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	18,978	21,541
Estimated Useful Life, minimum (in years)	3	3
Estimated Useful Life, maximum (in years)	10	10
Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	19,845	15,391
Estimated Useful Life, minimum (in years)	5	5
Estimated Useful Life, maximum (in years)	10	10
Autos, Trucks, And Airplanes [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,951	$ 1,895
Estimated Useful Life, minimum (in years)	5	5
Estimated Useful Life, maximum (in years)	10	10