Stockholders' Equity (Stock Options Granted) (Details) (USD $)	69 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012 April 17, 2012 [Member]	Dec. 31, 2012 April 19, 2011 [Member]	Dec. 31, 2012 April 20, 2010 [Member]	Dec. 31, 2012 April 21, 2009 [Member]	Dec. 31, 2012 April 15, 2008 [Member]	Dec. 31, 2012 April 17, 2007 [Member]
Grant Date [Line Items]
Options granted	7,895,000	1,235,000	410,000	530,000	790,000	550,000	4,380,000
Option exercise (strike) price		$ 54.00	$ 35.00	$ 30.00	$ 27.00	$ 27.00	$ 22.50
Closing stock price on date of grant		$ 49.01	$ 31.78	$ 27.13	$ 17.61	$ 24.35	$ 20.15
Options outstanding	4,835,792	1,177,500	380,000	380,000	540,000	286,167	2,072,125
Options vested	1,168,792	0	0	0	0	116,167	1,052,625