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Segment Reporting (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Jul. 31, 2015
Segment Reporting, Asset Reconciling Item      
Gross selling price   $ 105.3 $ 105.3
Mindjet      
Segment Reporting, Asset Reconciling Item      
Voting interest percentage   19.30%  
Equity Securities | Mindjet      
Segment Reporting, Asset Reconciling Item      
Voting interest percentage 19.30% 19.30%