Stock-Based Compensation (Details)	Dec. 31, 2012	Dec. 31, 2011	Jun. 03, 2011	Dec. 31, 2010	Dec. 31, 2009
Schedule of stock options and awards
Common stock shares available for grant	3,410,747		4,979,263
Common stock options outstanding	3,155,631	3,267,838		4,000,526	5,041,235
Stock Options [Member]
Schedule of stock options and awards
Common stock options outstanding	3,155,631
Restricted Stock Awards [Member]
Schedule of stock options and awards
Restricted stock outstanding	44,000	18,000		18,000	27,000
Restricted Stock Units [Member]
Schedule of stock options and awards
Restricted stock outstanding	708,651	407,765		417,923	198,055