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Business Combination Signal Demand (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 16, 2013
SignalDemand [Member]
Jun. 30, 2014
SignalDemand [Member]
Jun. 30, 2014
SignalDemand [Member]
Business Acquisition [Line Items]              
Business Combination, Acquisition Related Costs $ 579 $ 0 $ 1,969 $ 0   $ 300 $ 1,000
Finite-lived Intangible Assets Acquired     8,300       8,300
Deferred Tax Assets Acquired           5,324 5,324
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets           881 881
Business Acquisition, Purchase Price Allocation, Other Assets           2,752 2,752
Business Acquisition, Purchase Price Allocation, Other Noncurrent Assets           193 193
Finite-lived Intangible Assets Acquired           8,300 8,300
Goodwill, Acquired During Period             7,076
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets Noncurrent           2,572 2,572
Business Acquisition, Purchase Price Allocation, Current Liabilities           1,586 1,586
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue           6,688 6,688
Business Combination, Consideration Transferred         $ 13,500