Other Income and Other Expense (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Other income:
Interest income	$ 76	$ 605
Miscellaneous	682	155
Total other income	758	760
Other expense:
Non-operating costs	(1,932)	(1,850)
Investment loss - net	(112)	(53)
Miscellaneous	(1,708)	(2,165)
Total other expense	$ (3,752)	$ (4,068)