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Fair Value Measurements (Details) (Recurring [Member], USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended 3 Months Ended
Jun. 30, 2014
Level 1 [Member]
Dec. 31, 2013
Level 1 [Member]
Jun. 30, 2014
Level 3 [Member]
Dec. 31, 2013
Level 3 [Member]
Jun. 30, 2014
Total [Member]
Dec. 31, 2013
Total [Member]
Jun. 30, 2014
Money Market Funds [Member]
Level 1 [Member]
Dec. 31, 2013
Money Market Funds [Member]
Level 1 [Member]
Jun. 30, 2014
Money Market Funds [Member]
Total [Member]
Dec. 31, 2013
Money Market Funds [Member]
Total [Member]
Jun. 30, 2014
Contingent Earn-Out [Member]
Level 3 [Member]
Dec. 31, 2013
Contingent Earn-Out [Member]
Level 3 [Member]
Jun. 30, 2014
Contingent Earn-Out [Member]
Total [Member]
Dec. 31, 2013
Contingent Earn-Out [Member]
Total [Member]
Jun. 30, 2014
Engage [Member]
Contingent Earn-Out [Member]
Level 3 [Member]
Dec. 31, 2013
Engage [Member]
Contingent Earn-Out [Member]
Level 3 [Member]
Jun. 30, 2014
Synchronite, LLC [Member]
Contingent Earn-Out [Member]
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                  
Assets, Fair Value Disclosure $ 8,488 $ 13,674     $ 8,488 $ 13,674 $ 8,488 $ 13,674 $ 8,488 $ 13,674              
Liabilities, Fair Value Disclosure     3,220 1,660 3,220 1,660         3,220 1,660 3,220 1,660 1,400 1,700  
Change in contingent consideration     $ 1,810 $ 0                         $ 1,800