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Summary of Business and Significant Accounting Policies (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commission | [1] |  |  |  |  |  |  |  |  | $ 176,883 |  | $ 177,234 |  | $ 184,933 |
Other | [1] |  |  |  |  |  |  |  |  | 13,823 |  | 16,090 |  | 18,414 |
Revenue |  | $ 83,118 | $ 31,466 | $ 34,566 | $ 41,556 | $ 77,415 | $ 28,642 | $ 35,856 | $ 51,411 | 190,706 | [1] | 193,324 | [1] | 203,347 | [1]
Medicare |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commission |  |  |  |  |  |  |  |  |  | $ 134,087 |  | $ 116,097 |  | $ 91,521 |
Medicare | Medicare Advantage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LTV Commissions |  | 7.00% |  |  |  | 7.00% |  |  |  | 7.00% |  | 7.00% |  | 7.00% |
Commission |  |  |  |  |  |  |  |  |  | $ 107,567 |  | $ 95,736 |  | $ 75,479 |
Medicare | Medicare Supplement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LTV Commissions |  | 5.00% |  |  |  | 5.00% |  |  |  | 5.00% |  | 5.00% |  | 5.00% |
Commission |  |  |  |  |  |  |  |  |  | $ 15,435 |  | $ 11,561 |  | $ 9,271 |
Medicare | Medicare Part D |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LTV Commissions |  | 5.00% |  |  |  | 5.00% |  |  |  | 5.00% |  | 5.00% |  | 5.00% |
Commission |  |  |  |  |  |  |  |  |  | $ 11,085 |  | $ 8,800 |  | $ 6,771 |
Individual and Family |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commission |  |  |  |  |  |  |  |  |  | $ 17,079 |  | $ 33,217 |  | $ 59,420 |
Ancillary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LTV Commissions |  | 10.00% |  |  |  | 10.00% |  |  |  | 10.00% |  | 10.00% |  | 10.00% |
Commission |  |  |  |  |  |  |  |  |  | $ 16,048 |  | $ 18,446 |  | $ 23,391 |
Small Business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LTV Commissions |  | 0.00% |  |  |  | 0.00% |  |  |  | 0.00% |  | 0.00% |  | 0.00% |
Commission |  |  |  |  |  |  |  |  |  | $ 7,501 |  | $ 6,133 |  | $ 5,788 |
Commission Bonus |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commission |  |  |  |  |  |  |  |  |  | $ 2,168 |  | $ 3,341 |  | $ 4,813 |
Non-Qualified Health Plans | Individual and Family |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LTV Commissions |  | 15.00% |  |  |  | 15.00% |  |  |  | 15.00% |  | 15.00% |  | 15.00% |
Commission |  |  |  |  |  |  |  |  |  | $ 10,024 |  | $ 18,852 |  | $ 40,630 |
Qualified Health Plans | Individual and Family |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LTV Commissions |  | 20.00% |  |  |  | 20.00% |  |  |  | 20.00% |  | 20.00% |  | 20.00% |
Commission |  |  |  |  |  |  |  |  |  | $ 7,055 |  | $ 14,365 |  | $ 18,790 |
Short-term | Ancillary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commission |  |  |  |  |  |  |  |  |  | 5,504 |  | 7,276 |  | 7,788 |
Dental | Ancillary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commission |  |  |  |  |  |  |  |  |  | 5,064 |  | 6,968 |  | 10,702 |
Vision | Ancillary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commission |  |  |  |  |  |  |  |  |  | 1,607 |  | 2,013 |  | 2,575 |
Other | Ancillary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commission |  |  |  |  |  |  |  |  |  | $ 3,873 |  | $ 2,189 |  | $ 2,326 |
[1] | As adjusted for the adoption of ASC 606 using the full retrospective method

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