Stock Plans (Narrative) (Details)	9 Months Ended
	Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options expiration period, years	ten
Stock options exercisable period after grant date, years	three
Restricted stock vest period after grant date, years	three
Restricted stock for management retention, vesting tranches	three
Restricted stock for management retention, vesting period after grant date, years	four, five, and six years
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued for performance stock units	0.00%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued for performance stock units	200.00%