Stock-Based Compensation (Risk-Free Interest Rate) (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stock-Based Compensation [Abstract]
Risk-free interest rate	0.60%	0.90%	2.00%
Expected volatility	58.20%	58.10%	60.10%
Expected term	5 years 0 months 0 days	5 years 0 months 0 days	5 years 0 months 0 days