Other Income and Other Expense (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Other income:
Interest income	$ 429	$ 833	$ 1,364	$ 2,597
Investment gains - net		3,413	1,249	1,074
Miscellaneous	12	15	17	180
Total other income	441	4,261	2,630	3,851
Other expense:
Non-operating costs	(1,807)	(2,933)	(4,925)	(6,035)
Investment losses - net	(57)
Miscellaneous	(1,188)	(961)	(2,996)	(2,733)
Total other expense	$ (3,052)	$ (3,894)	$ (7,921)	$ (8,768)