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Capitalized Software Development Costs (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Capitalized Software Development Costs [Line Items]      
Capitalized Computer Software, Additions $ 622 $ 514  
Capitalized Software Development Costs for Software Sold to Customers 8,659   $ 8,499
Capitalized Computer Software, Amortization $ 525 $ 410  
Property and Casualty Exchange [Member]      
Capitalized Software Development Costs [Line Items]      
Capitalized Computer Software, amortization period 5 years    
Minimum [Member] | Continuing Medical Education Products [Member]      
Capitalized Software Development Costs [Line Items]      
Capitalized Computer Software, amortization period 3 years    
Maximum [Member] | Continuing Medical Education Products [Member]      
Capitalized Software Development Costs [Line Items]      
Capitalized Computer Software, amortization period 5 years