Summary Of Significant Accounting Policies (Summary Of Stock-Based Compensation Expense) (Details) (USD $)	0 Months Ended	12 Months Ended
	Jan. 05, 2009	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		$ 11,612,000	[1]	$ 11,233,000	[1]	$ 16,989,000	[1]
Restricted common stock expense				85,000,000		744,000,000
Performance stock expense		1,057,000		477,000
Stock-based compensation expense related to realignment of workforce and business	3,900,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		4,941,000		5,732,000		10,535,000
Restricted Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		321,000	[2]	1,670,000	[2]	4,599,000	[2]
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		5,293,000		3,354,000		1,855,000
Performance Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		1,057,000	[3]	477,000	[3]
EBITDA Performance Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted common stock expense				40,000,000		486,000,000
Market Value Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted common stock expense				45,000,000		258,000,000
ANI Performance Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance stock expense		452,000		157,000
Percentage of individual award allocated		50.00%
TSR Performance Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance stock expense		$ 605,000		$ 320,000
Percentage of individual award allocated		50.00%

[1] Included in stock-based compensation expense for the year ended December 31, 2009 was $3.9 million of stock-based compensation expense related to the realignment of our workforce and business on January 5, 2009. For further information about the realignment of our workforce and business, please refer to Note 15.

[2] Awards granted under the Long-Term Incentive Plan (LTIP) consisted of restricted common stock. Each individual's total award was allocated 50% to achieving earnings before interest, taxes, depreciation and amortization (EBITDA Performance Award) and 50% to the market value of our common stock (Market Value Award). For further information regarding our stock-based compensation plans, please refer to Note 12.

[3] Performance stock units granted to certain executive officers consisted of restricted stock units. Each individual's total award for the 2010 and 2011 grants were allocated 50% to achieving adjusted net income (ANI) targets for the years ended December 31, 2010 and 2011 (ANI Performance Award), respectively, and 50% to the total shareholder return (TSR) of our common stock as compared to other companies in the NASDAQ Internet Index for the three year period 2010 to 2012 (2010 grant) and fiscal years 2011 to 2013 (2011 grant) (TSR Performance Award). For further information regarding our stock-based compensation plans, please refer to Note 12.