Long-Term Incentive Plans (Number Of Significant Options Granted And Assumptions Used For Valuing Option Grants) (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2010 years	Mar. 31, 2009 years	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011
Long-Term Incentive Plans [Abstract]
Number of options granted	1,100,000	1,900,000	1,100,000	1,900,000
Exercise price	$ 5.05	$ 4.02	$ 53.1172	$ 50.0301	$ 46.1478
Dividend yield	0.00%	0.705%
Expected volatility	0.9938%	0.852%
Risk-free interest rate	2.585%	2.209%
Expected option term (in years)	5.00	5.00