Other Income and Other Expense (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Other income:
Interest income	$ 605	$ 391
Investment gains - net		1,293
Miscellaneous	155	6
Total other income	760	1,690
Other expense:
Non-operating costs	(1,850)	(1,487)
Investment losses - net	(53)
Miscellaneous	(2,165)	(254)
Total other expense	$ (4,068)	$ (1,741)