Discontinued Operations And Other Disposition (Summary Of Discontinued Operations Presented In Consolidated Statements Of Income And Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Discontinued Operations And Other Disposition [Abstract]
Operating revenues	$ 2,078	$ 5,934	$ 10,496	$ 25,308
Total operating expenses	1,884	4,206	7,440	20,212
Operating income	194	1,728	3,056	5,096
Gain on sale			(5,469)	(14,718)
Other, net	1	909	1	1,001
Income from discontinued operations before income taxes	193	819	8,524	18,813
Provision for income taxes	60	444	3,019	7,758
Income from discontinued operations	$ 133	$ 375	$ 5,505	$ 11,055