Other Income and Other Expense (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Other income:
Interest income	$ 307	$ 429	$ 1,018	$ 1,364
Investment gains - net				1,249
Miscellaneous	113	12	339	17
Total other income	420	441	1,357	2,630
Other expense:
Non-operating costs	(1,645)	(1,807)	(5,885)	(4,925)
Investment losses - net	(2,254)	(57)	(2,366)
Miscellaneous	(1,797)	(1,188)	(4,182)	(2,996)
Total other expense	$ (5,696)	$ (3,052)	$ (12,433)	$ (7,921)