Other Income and Other Expense (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Other income:
Interest income	$ 116	$ 307	$ 1,291	$ 1,018
Miscellaneous	44	113	96	339
Total other income	160	420	1,387	1,357
Other expense:
Non-operating costs	(2,028)	(1,645)	(5,951)	(5,885)
Investment losses - net	(3,435)	(2,254)	(3,643)	(2,366)
Miscellaneous	(1,972)	(1,797)	(3,827)	(4,182)
Total other expense	$ (7,435)	$ (5,696)	$ (13,421)	$ (12,433)