Stockholders' Equity (Reconciliation of Common Stock Share Activity) (Details) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stockholders' Equity Note [Abstract]
Common stock, beginning balance	1,013,164	1,004,351	990,855
Common stock, issued	14,671	22,650	18,891
Common stock, retired	(7,778)	(13,837)	(5,395)
Common stock, ending balance	1,020,057	1,013,164	1,004,351
Held in treasury, beginning balance	(87,041)	(87,041)	87,041
Held in treasury, repurchased	(7,778)	(13,837)	(5,395)
Held in treasury, retired	7,778	13,837	5,395
Held in treasury, ending balance	(87,041)	(87,041)	(87,041)