Stockholder's Equity (Summary Of Stock Option Plan Activity) (Details) (USD $)	69 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012 Stock Option Plan [Member]		Dec. 31, 2011 Stock Option Plan [Member]		Dec. 31, 2010 Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning Balance, Options Outstanding		5,132,750		5,320,000
Granted, Options Outstanding	7,895,000	1,235,000		410,000
Exercised/earned, Options Outstanding		(1,305,708)		(397,250)
Cancelled/Forfeited, Options Outstanding		(226,250)		(200,000)
Ending Balance, Options Outstanding	4,835,792	4,835,792		5,132,750		5,320,000
Exercisable, Options Outstanding		1,168,792		1,852,750
Beginning Balance, Exercise Price		$ 24.92	[1]	$ 24.03	[1]
Granted, Exercise Price		$ 54.00	[1]	$ 35.00	[1]
Exercised/Earned, Exercise Price		$ 22.70	[1]	$ 22.50	[1]
Cancelled/Forfeited, Exercise Price		$ 34.12	[1]	$ 26.78	[1]
Ending Balance, Exercise Price		$ 32.51	[1]	$ 24.92	[1]	$ 24.03	[1]
Exercisable, Exercise Price		$ 22.95	[1]	$ 22.50	[1]
Outstanding, Remaining Life		5 years 4 months 24 days	[2]	4 years 8 months 19 days	[2]	5 years 6 months	[2]
Granted, Remaining Life		8 years 4 months 28 days	[2]	7 years 11 months 5 days	[2]
Exercisable, Remaining Life		3 years 5 months 12 days	[2]	3 years 1 month 28 days	[2]

[1] Weighted-average exercise price

[2] Weighted-average remaining contractual life in years