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Capitalized Software Development Costs (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Capitalized Software Development Costs [Line Items]      
Capitalized Computer Software, Additions $ 4,100   $ 5,700
Capitalized Software Development Costs for Software Sold to Customers 13,748   $ 11,742
Capitalized Computer Software, Amortization $ 1,931 $ 1,608  
Property and Casualty Exchange [Member]      
Capitalized Software Development Costs [Line Items]      
Capitalized Computer Software, amortization period 5 years