Preferred And Common Stock (Schedule Of Share-Based Compensation) (Details)	12 Months Ended
	Dec. 31, 2011
2002 And Prior [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting	One year
Term	10 years
Reload feature	One reload over option term
2003 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting	3 years (1/3 each year)
Term	10 years
Reload feature	One reload in 2004 for 1/3vesting in 2004
2004 - 2009 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting	3 years (1/3 each year)
Term	6 years
Reload feature	None
2010 And Forward [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting	3 years (1/3 each year)
Term	10 years
Reload feature	None