Other Income and Other Expense (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other income:
Interest income	$ 1,629	$ 1,239	$ 1,850
Investment gains - net			1,165
Miscellaneous	75	367	96
Total other income	1,704	1,606	3,111
Other expense:
Non-operating costs	(8,207)	(7,777)	(7,037)
Investment loss - net	(3,711)	(2,453)
Miscellaneous	(4,106)	(9,612)	(3,414)
Total other expense	$ (16,024)	$ (19,842)	$ (10,451)