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Subsequent Events Subsequent Event TVN Acquisition Narratives (Details) - Subsequent Event [Member]
€ in Millions, $ in Millions
Feb. 29, 2016
USD ($)
Feb. 29, 2016
EUR (€)
Feb. 11, 2016
Business Acquisition [Line Items]      
Cash, Cash Equivalents, and Short-term Investments $ 70.0    
TVN [Member]      
Business Acquisition [Line Items]      
Business Acquisition, Percentage of Voting Interests Acquired     100.00%
Business Combination, Consideration Transferred, Other 76.5    
Maximum [Member] | TVN's 2015 revenue, difference as converted from euros to US dollars [Member] | TVN [Member]      
Business Acquisition [Line Items]      
Business Combination, Contingent Consideration, Liability 75.0 € 76  
Maximum [Member] | TVN's 2015 backlog [Member] | TVN [Member]      
Business Acquisition [Line Items]      
Business Combination, Contingent Consideration, Liability $ 5.0