Employee Stock Purchase Plan Stock Options and Warrants - Long Term Incentive Plans (Details) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
2006 Incentive Plan [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	1,300
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	257
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	69
Stock Options [Member] | 2006 Incentive Plan [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Stock Option Contractual Life	7 years
Stock Options [Member] | 2006 Incentive Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years
Stock Option Contractual Life	10 years
Performance Shares [Member] | 2006 Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	1 year