Other Income (Expense), Net (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Other Income and Expenses [Abstract]
Interest income (expense)	$ 197	$ (25)	$ 396	$ 632
Other nonoperating income	29	46	70	39
Insurance policy expense	(69)	(61)	(191)	(211)
Other nonoperating expense	(2)	0	(5)	0
Other income (expense), net	$ 155	$ (40)	$ 270	$ 460