Stockholder's Equity (Summary Of Stock Option Plan Activity) (Details) (Stock Option Plan [Member], USD $)	12 Months Ended
	Dec. 31, 2011 years		Dec. 31, 2010 years
Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance, Options Outstanding	5,320,000		5,120,000
Granted, Options Outstanding	410,000		530,000
Exercised/Earned, Options Outstanding	(397,250)		0
Cancelled/Forfeited, Options Outstanding	(200,000)		(330,000)
Ending Balance, Options Outstanding	5,132,750		5,320,000
Exercisable, Options Outstanding	1,852,750		638,000
Beginning Balance, Exercise Price	$ 24.03	[1]	$ 23.54	[1]
Granted, Exercise Price	$ 35.00	[1]	$ 30.00	[1]
Exercised/Earned, Exercise Price	$ 22.50	[1]	$ 0.00	[1]
Cancelled/Forfeited, Exercise Price	$ 26.78	[1]	$ 26.00	[1]
Ending Balance, Exercise Price	$ 24.92	[1]	$ 24.03	[1]
Exercisable, Exercise Price	$ 22.50	[1]	$ 22.50	[1]
Beginning Balance, Remaining Life	5.50	[2]	6.28	[2]
Granted, Remaining Life	7.93	[2]	8.41	[2]
Ending Balance, Remaining Life	4.72	[2]	5.50	[2]
Exercisable, Remaining Life	3.16	[2]	2.57	[2]

[1] Weighted-average exercise price

[2] Weighted-average remaining contractual life in years