Acquisitions (Purchase Price Preliminary Allocation) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Nov. 09, 2012 Engage [Member]	Jun. 13, 2012 LookIO [Member]
Business Acquisition [Line Items]
Cash		$ 386
Accounts receivable		3,454
Other currents assets		57
Property and equipment		432
Other assets		104
Intangible assets	3,600	3,600	767
Goodwill		6,073	2,405
Total assets acquired		14,106	3,172
Liabilities assumed		(2,632)
Deferred tax liability, net		(962)	(288)
Total purchase price consideration	$ 20	$ 10,512	$ 2,884