Stock Based Compensation (Details 2) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Employee stock option grants [Member]
Stock option grants and warrant
Risk-free interest rate	0.38%	0.64%	0.47%	1.05%
Expected dividend yield	0.00%	0.00%	0.00%	0.00%
Expected volatility	44.00%	46.00%	44.00%	47.00%
Expected life	3 years 3 months 18 days	3 years 3 months 18 days	3 years 1 month 6 days	3 years
Non-employee stock option grant [Member]
Stock option grants and warrant
Risk-free interest rate			0.26%
Expected dividend yield			0.00%
Non-employee stock option grant [Member] | Maximum [Member]
Stock option grants and warrant
Expected volatility			41.00%
Expected life			2 years 2 months 12 days
Non-employee stock option grant [Member] | Minimum [Member]
Stock option grants and warrant
Expected volatility			38.00%
Expected life			1 year 7 months 6 days
Market Stock Unit Grants [Member]
Stock option grants and warrant
Risk-free interest rate		0.15%		0.15%
Expected dividend yield		0.00%		0.00%
Closing Price		8.74		8.74
Expected volatility		37.40%		37.40%
Expected life		1 year		1 year
Market Stock Unit Grants [Member] | iShares Russell 2000 Index [Member]
Stock option grants and warrant
Expected dividend yield		1.08%		1.08%
Closing Price		82.29		82.29
Expected volatility		20.30%		20.30%
Warrant grant [Member]
Stock option grants and warrant
Risk-free interest rate	0.68%	0.46%		0.46%
Expected dividend yield	0.00%	0.00%		0.00%
Expected volatility	47.00%	39.00%		39.00%
Expected life	4 years 10 months 24 days	2 years		2 years
Warrant grant [Member] | Maximum [Member]
Stock option grants and warrant
Risk-free interest rate			0.89%
Expected volatility			48.00%
Expected life			5 years 4 months 24 days
Warrant grant [Member] | Minimum [Member]
Stock option grants and warrant
Risk-free interest rate			0.68%
Expected dividend yield			0.00%
Expected volatility			46.00%
Expected life			4 years 10 months 24 days