Discontinued Operations (Summarized Income (Loss) from Discontinued Operations, Net Of Tax) (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Discontinued Operation, Additional Disclosures [Abstract]
Operating revenues									$ 46,980	$ 462,658	$ 679,640
Operating costs and expenses									(37,257)	(519,162)	(690,963)
Gain (loss) from discontinued operations									9,723	(56,504)	(11,323)
Provision (benefit) for income taxes									4,408	(20,559)	(3,868)
Net Gain (Loss) from Discontinued Operations									5,315	(35,945)	(7,455)
Gain on sales and disposition of discontinued operations									351,133	157,449	23,759
(Benefit) provision for income taxes on sales and disposition of discontinued operations									(15,801)	57,489	(64,591)
Income from Discontinued Operations, Net of Tax	$ 2,308	$ (6,980)	$ 375,189	$ 1,732	$ 106,335	$ (23,988)	$ (1,772)	$ (16,560)	$ 372,249	$ 64,015	$ 80,895