Discontinued Operations (Results of Operations Associated with Discontinued Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013		Sep. 30, 2014	Sep. 30, 2013
Discontinued Operations [Abstract]
Revenues	$ 509,037	$ 4,502,100		$ 2,752,557	$ 15,981,683
Income before income taxes, including pretax gain on disposals of $130,568 during the nine month period in 2013	(27,163)	38,329		(61,396)	355,668
Income tax expense (benefit)	(1,813)	18,598		(8,757)	15,266
Income (loss) from discontinued operations	(25,350)	19,731	[1]	(52,639)	340,402	[1]
Gain on disposal					$ 130,568

[1] Reclassified to conform to current presentation - See Note D.