Business Acquisition Business Acquisitions (Allocation Of Aggregate Purchase Price) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Business Acquisition [Line Items]
Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment	$ 3,274,000
Business Acquisition Purchase Price Allocation Current Noncurrent Assets Prepaid Expense and Other Assets	2,703,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets Noncurrent	2,058,000
Goodwill, Acquired During Period	54,472,000	128,532,000
Business Combination, Consideration Transferred	163,450,000
Business Acquisition, Purchase Price Allocation, Goodwill, Expected Tax Deductible Amount	36,600,000
Business Acquisition, Purchase Price Allocation, Current Assets, Receivables	24,658,000
Developed Technology Rights [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	3,031,000
Trade Names [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	2,460,000
Trade Names [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	18,581,000
Customer Relationships [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	40,275,000
Licensing Relationship [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	11,770,000
Other Intangible Assets [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	168,000
Ziff Davis, Inc [Member]
Business Acquisition [Line Items]
Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment		842,000
Business Acquisition Purchase Price Allocation Current Noncurrent Assets Prepaid Expense and Other Assets		1,283,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets Noncurrent		1,139,000
Goodwill, Acquired During Period		112,882,000
Business Combination, Consideration Transferred		200,436,000
Business Acquisition, Purchase Price Allocation, Goodwill, Expected Tax Deductible Amount		12,900,000
Business Acquisition, Purchase Price Allocation, Current Assets, Receivables		14,450,000
Business Acquisition, Cost of Acquired Entity, Cash Paid		163,100,000
Ziff Davis, Inc [Member] | Developed Technology Rights [Member]
Business Acquisition [Line Items]
Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment		4,780,000
Ziff Davis, Inc [Member] | Trade Names [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		37,730,000
Ziff Davis, Inc [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		5,380,000
Ziff Davis, Inc [Member] | Licensing Relationship [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		14,500,000
Ziff Davis, Inc [Member] | Licensing Relationship [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		4,910,000
Ziff Davis, Inc [Member] | Other Intangible Assets [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		$ 2,540,000