Share-Based Compensation Plans (Option Assumptions Used in Black-Scholes) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-Based Compensation Plans Option Assumptions Used In Black-Scholes Details
Dividend yield	$ 0	$ 0	$ 0
Expected volatility, minimum	59.15%	61.22%	60.50%
Expected volatility, maximum	60.69%	67.58%	67.80%
Risk-free interest rate, minimum	0.70%	0.60%	0.90%
Risk-free interest rate, maximum	3.70%	1.10%	3.00%
Expected term, in years, minimum	5 years 73 days	5 years 37 days	4 years 292 days
Expected term, in years, maximum	6 years	5 years 329 days	5 years 329 days