Other Income and Other Expense (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Other income:
Interest income	$ 543	$ 635	$ 935	$ 1,572
Investment gains - net	12		1,307
Miscellaneous	2	308	5	320
Total other income	557	943	2,247	1,892
Other expense:
Non-operating costs	(1,629)	(1,237)	(3,119)	(3,084)
Investment losses - net		(3,561)		(2,339)
Miscellaneous	(1,557)	(852)	(1,808)	(1,753)
Total other expense	$ (3,186)	$ (5,650)	$ (4,927)	$ (7,176)