Accrued Liabilities (Narrative) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Accrued Liabilities [Abstract]
Accrued product liability	$ 6,060,000	$ 6,395,000
Accrued payroll liability	6,135,000	5,721,000
Environmental accrued liability	1,650,000	1,875,000
Other accrued liabilities	$ 2,062,000	$ 1,263,000