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Summary of Business and Significant Accounting Policies (Goodwill) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Goodwill [Line Items]    
Goodwill [1] $ 14,096 $ 14,096
Individual, Family and Small Business Segment    
Goodwill [Line Items]    
Goodwill   10,400
Medicare Segment    
Goodwill [Line Items]    
Goodwill   $ 3,700
[1] As adjusted for the adoption of ASC 606 using the full retrospective method