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Business Combination Signal Demand (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 0 Months Ended 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 16, 2013
SignalDemand [Member]
Mar. 31, 2014
SignalDemand [Member]
Business Acquisition [Line Items]        
Business Combination, Acquisition Related Costs $ 1,390 $ 0   $ 700
Finite-lived Intangible Assets Acquired 8,300     8,300
Deferred Tax Assets Acquired       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
Business Acquisition, Purchase Price Allocation, Other Assets       2,752
Business Acquisition, Purchase Price Allocation, Other Noncurrent Assets       193
Finite-lived Intangible Assets Acquired       8,300
Goodwill, Acquired During Period       6,972
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets Noncurrent       2,572
Business Acquisition, Purchase Price Allocation, Current Liabilities       1,482
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue       6,688
Business Combination, Consideration Transferred     $ 13,500