Discontinued Operations (Summarized (Loss) Income from Discontinued Operations, Net Of Tax) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended							9 Months Ended		12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011
Discontinued Operations [Abstract]
Operating revenues	$ 124,725				$ 137,668			$ 382,705	$ 441,308
Expenses in discontinued operations	165,380				155,701			467,434	491,698
Loss from discontinued operations	(40,655)				(18,033)			(84,729)	(50,390)
Benefit from income taxes	(14,783)				(5,568)			(30,059)	(16,568)
Net Loss from Discontinued Operations	(25,872)				(12,465)			(54,670)	(33,822)
(Loss) gain on sales of discontinued operations	0				(2,174)			(70)	23,759
Benefit from income taxes on sales of discontinued operations	0				(52,178)			(24)	(64,591)
(Loss) Income from Discontinued Operations, Net of Tax	$ (25,872)	$ (7,620)	$ (21,224)	$ 5,600	$ 37,539	$ 10,264	$ 6,725	$ (54,716)	$ 54,528	$ 60,128	$ (34,231)