Income Taxes (Reconciliation Of Effective Tax Rate) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Tax computed at statutory rate	$ 405,790	$ 975,798	$ 574,682
State income taxes, net of federal tax benefit	21,363	110,739	64,284
Domestic production activities deduction	(22,101)	(54,745)	(32,194)
Noncontrolling interest in net income	(12,378)	(12,783)	(14,221)
Uncertain tax positions	(193)	7,309	(12,125)
Other	(905)	1,644	1,565
Income tax provision total	$ 391,576	$ 1,027,962	$ 581,991