Other Income and Other Expense (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:
Interest income	$ 467	$ 107	$ 1,176	$ 712
Miscellaneous	2	70	51	225
Total other income	469	177	1,227	937
Other expense:
Non-operating costs	(1,990)	(2,389)	(3,923)	(4,239)
Investment losses - net	(96)	(58)	(208)	(112)
Miscellaneous	(148)	(222)	(1,855)	(2,386)
Total other expense	$ (2,234)	$ (2,669)	$ (5,986)	$ (6,737)