Stockholders' Equity and Stock-Based Compensation (Details 4)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Assumptions used to calculate the fair value of option and SAR award on the grant date using the Black-Scholes option pricing model
Risk-free interest rates, minimum	0.70%	1.10%	1.50%
Risk-free interest rates, maximum	1.00%	1.90%	2.50%
Expected lives (in years)	5 years 6 months	5 years 6 months	5 years 6 months
Expected dividend yield	0.00%	0.00%	0.00%
Expected volatility, minimum	67.80%	65.90%	67.40%
Expected volatility, maximum	72.20%	80.20%	65.90%
Minimum [Member]
Assumptions used to calculate the fair value of option and SAR award on the grant date using the Black-Scholes option pricing model
Expected lives (in years)			3 years 7 months 6 days
Maximum [Member]
Assumptions used to calculate the fair value of option and SAR award on the grant date using the Black-Scholes option pricing model
Expected lives (in years)			5 years 6 months