Other Expense, Net (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Other Expense, Net [Abstract]
Interest income	$ 113	$ 43
Other nonoperating income	3	28
Insurance policy expense	(164)	(193)
Other expense, net	$ (48)	$ (122)