Product Warranties (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Product Warranties [Line Items]
Product recall campaign, recognized charges				$ 700,000
Brake drum quality issue, recognized charges				2,500,000
Product warranty activity [Roll Forward]
Balance-beginning of period	301,000	294,000	797,000
Provision for new warranties	66,000	249,000	568,000
Payments	(117,000)	(258,000)	(1,071,000)
Sale of certain assets and liabilities	(8,000)	16,000	0
Balance-end of period	$ 242,000	$ 301,000	$ 294,000	$ 797,000
Minimum [Member]
Product Warranties [Line Items]
Product warranty period, minimum	1 year
Maximum [Member]
Product Warranties [Line Items]
Product warranty period, minimum	5 years