Stockholders Equity and Stock Options (Summary Of Non-Vested Stock Options) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Options granted, Weighted Average Fair Value	$ 9.14	$ 12.87	$ 13.58
Non-vested Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested [Roll Forward]
Nonvested shares under options, December 31, 2010	1,459,008
Options granted, number of shares	986,000
Vested during period, number of shares	(609,419)
Options cancelled, number of shares	(216,334)
Nonvested shares under options, December 31, 2011	1,619,255
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Nonvested stock options at December 31, 2010, Weighted Average Fair Value	$ 12.77
Vested during period, Weighted Average Fair Value	$ 12.75
Options cancelled, Weighted Average Fair Value	$ 12.32
Nonvested stock options at December 31, 2011, Weighted Average Fair Value	$ 10.47