Other Income, Net (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Other Income (Expense), Net [Abstract]
Other income, net	$ 46	$ 406	$ 27
Interest Income [Member]
Other Income (Expense), Net [Abstract]
Other income, net	379	506	250
Other Nonoperating Income [Member]
Other Income (Expense), Net [Abstract]
Other income, net	36	11	57
Insurance Policy Expense [Member]
Other Income (Expense), Net [Abstract]
Other income, net	$ (369)	$ (111)	$ (280)