Summary Of Operations And Significant Accounting Policies (Changes In Carrying Amount Of Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended				12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Business [Member]	Dec. 31, 2011 Business [Member]	Dec. 31, 2012 Consumer [Member]	Dec. 31, 2011 Consumer [Member]	Dec. 31, 2010 Consumer [Member]	Dec. 31, 2012 Engage [Member]	Dec. 31, 2012 Engage [Member] Business [Member]	Dec. 31, 2012 LookIO [Member]	Dec. 31, 2012 LookIO [Member] Business [Member]
Goodwill [Line Items]
Beginning Balance	$ 24,090	$ 24,015	$ 16,066	$ 15,991	$ 8,024	$ 8,024	$ 8,024
Adjustments to goodwill								6,073	6,073	2,405	2,405
Contingent earnout payments	77	75	77	75
Ending Balance	$ 32,645	$ 24,090	$ 24,621	$ 16,066	$ 8,024	$ 8,024	$ 8,024

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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