Summary Of Significant Accounting Policies Summary Of Significant Accounting Policies (Earnings per share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Numerator:
Net income	$ 140,545	$ 2,281,884	$ 257,244	$ 2,400,063
Less: earnings distributed to participating securities	(124)	(273)	(386)	(273)
Less: undistributed earnings allocated to participating securities	(820)	(15,884)	(1,362)	(17,526)
Numerator for basic earnings per share	139,601	2,265,727	255,496	2,382,264
Add back: undistributed earnings allocated to participating securities	820	15,884	1,362	17,526
Less: undistributed earnings reallocated to participating securities	812	15,753	1,349	17,358
Numerator for diluted earnings per share	$ 139,609	$ 2,265,858	$ 255,509	$ 2,382,432
Denominator:
Basic shares outstanding	373,531	382,883	376,097	384,159
Effect of dilutive securities	3,761	3,220	3,723	3,745
Diluted shares outstanding	377,292	386,103	379,820	387,904
Earnings Per Share [Abstract]
Earnings Per Share, Basic	$ 0.37	$ 5.92	$ 0.68	$ 6.20
Earnings Per Share, Diluted	$ 0.37	$ 5.87	$ 0.67	$ 6.14