Employee Stock Purchase Plan Stock Options and Warrants Stock Based Compensation Plans (Details) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Long Term Incentive Plan 2006 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Option Vesting Performance Based	1
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	1,400
Employee Stock Purchase Plan Qualified [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	281
Share Based Compensation Arragement Employee Stock Purchase Plan Percentage of Market Price Purchase Date	95.00%
Employee Stock Purchase Plan Non Qualified [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	79
Minimum [Member] | Long Term Incentive Plan 2006 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Option Vesting	3
Stock Option Contractual Life	7
Maximum [Member] | Long Term Incentive Plan 2006 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Option Vesting	5
Stock Option Contractual Life	10