Other Income, Net (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Other Income and Expenses [Abstract]
Interest income	$ 489	$ 914
Other nonoperating income	685	882
Insurance policy expense	(367)	(219)
Other Nonoperating Expense	(10)	0
Other income, net	$ 797	$ 1,577