Stock Options And Employee Stock Purchase Plan (Assumptions To Estimate Fair Value Of Stock Options) (Details)	7 Months Ended	12 Months Ended
	Jul. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Estimated forfeiture rate		14.58%	14.88%	14.50%
Risk-free interest rate		1.10%	2.30%	2.60%
Expected term (in years)		5 years 8 months 23 days	6 years 6 months	6 years 6 months
Dividend yield	0.00%	3.20%	2.60%	0.00%
Expected volatility		41.60%	41.80%	44.70%