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Description of Business and Summary of Significant Accounting Policies (Description of Business) (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Nov. 02, 2016
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2017
USD ($)
ProductService_Groups
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Segment Reporting Information [Line Items]                                
Total revenue, international percentage                           41.80% 28.40% 22.70%
Number of product/service groups | ProductService_Groups                           4    
Operating revenue   $ 104,681 $ 92,800 $ 87,387 $ 79,103 $ 80,046 $ 74,608 $ 72,574 $ 71,066 $ 70,204 $ 66,813 $ 64,712 $ 63,753 $ 363,971 $ 298,294 $ 265,482
Payments to Acquire Business, Held in Escrow                           4,040 0 0
Funds Held for Clients   $ 8,035       $ 14,394               8,035 14,394  
Exchanges                                
Segment Reporting Information [Line Items]                                
Operating revenue                           259,470 206,427 190,746
Broker P&C Systems                                
Segment Reporting Information [Line Items]                                
Operating revenue                           14,674 14,105 14,481
RCS                                
Segment Reporting Information [Line Items]                                
Operating revenue                           86,832 74,196 55,917
Carrier P&C Systems                                
Segment Reporting Information [Line Items]                                
Operating revenue                           $ 2,995 3,566 $ 4,338
WDEV                                
Segment Reporting Information [Line Items]                                
Payments to Acquire Business, Held in Escrow $ 2,900                           $ 2,900