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Capitalized Software Development Costs (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Capitalized Software Development Costs [Line Items]        
Capitalized Software Development Costs for Software Sold to Customers   $ 4,000    
Capitalized software development costs, net   5,955 $ 3,489  
Amortization of capitalized software development costs   1,116 $ 0 $ 0
New Accounting Pronouncement Or Change In Account Principle, Effect Of Amortization Period Adjustment To Production Costs   $ 2,900    
Continuing Medical Education Products [Member]        
Capitalized Software Development Costs [Line Items]        
Capitalized Computer Software, amortization period 18 months 5 years    
Property and Casualty Exchange [Member]        
Capitalized Software Development Costs [Line Items]        
Capitalized Computer Software, amortization period   5 years