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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+ Details

Goodwill and Intangible Assets (Changes in Carrying Amount of Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended		12 Months Ended						12 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2013 Engage [Member]	Dec. 31, 2012 Engage [Member]	Dec. 31, 2012 LookIO [Member]	Dec. 31, 2013 Consumer [Member]	Dec. 31, 2012 Consumer [Member]	Dec. 31, 2011 Consumer [Member]	Dec. 31, 2012 Business [Member]	Dec. 31, 2013 Business [Member]	Dec. 31, 2013 Business [Member] Engage [Member]	Dec. 31, 2012 Business [Member] Engage [Member]	Dec. 31, 2012 Business [Member] LookIO [Member]
Goodwill [Roll Forward]
Beginning Balance	$ 24,090	$ 32,724				$ 8,024	$ 8,024	$ 8,024	$ 16,066	$ 24,700
Goodwill Acquisitions			79	6,073	2,405						79	6,073	2,405
Other	77								77
Ending Balance	$ 32,645	$ 32,724				$ 8,024	$ 8,024	$ 8,024	$ 24,621	$ 24,700