Other Income, Net (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other Income and Expenses [Abstract]
Interest income	$ 538	$ 736	$ 324
Other nonoperating income	152	129	67
Insurance policy expense	(427)	(389)	(283)
Other nonoperating expense	(10)	0	(10)
Other income, net	$ 253	$ 476	$ 98