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

Summary of Operations and Significant Accounting Policies (Changes in Carrying Amount of Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended					6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Nov. 09, 2012	Dec. 31, 2012 Engage Pty Ltd. [Member]	Dec. 31, 2012 Look.io [Member]	Jun. 13, 2012 Look.io [Member]	Jun. 30, 2013 Business [Member]	Dec. 31, 2012 Business [Member]	Dec. 31, 2012 Business [Member] Engage Pty Ltd. [Member]	Dec. 31, 2012 Business [Member] Look.io [Member]	Jun. 30, 2013 Consumer [Member]	Dec. 31, 2012 Consumer [Member]	Dec. 31, 2011 Consumer [Member]
Goodwill [Line Items]
Beginning Balance	$ 32,645	$ 24,090					$ 24,621	$ 16,066			$ 8,024	$ 8,024	$ 8,024
Engage acquisition (see Note 3)	79						79
Goodwill			6,152	6,073	2,405	2,405			6,073	2,405
Contingent earnout payments (see Note 3)		77						77
Ending Balance	$ 32,724	$ 32,645					$ 24,700	$ 24,621			$ 8,024	$ 8,024	$ 8,024