Stock Based Compensation (Details) - Weighted average for key assumptions used in determining the fair value	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Weighted average for key assumptions used in determining the fair value [Abstract]
Expected price volatility	53.25%	45.89%
Risk-free interest rate	0.91%	1.34%
Weighted average expected life in years	5 years 6 months	5 years 255 days
Forfeiture rate	21.87%	19.82%