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Summary of Business and Significant Accounting Policies (Narrative) (Details) $ in Thousands | 12 Months Ended | 20 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) segment state | Dec. 31, 2016 USD ($) segment | Dec. 31, 2015 USD ($) | Jun. 30, 2012 USD ($)
Accounting Policies [Abstract] |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  |  | $ 13,900
Advertising Expense |  | $ 56,000 | $ 64,800 | $ 66,500 |
Research and Development Expense |  | 7,600 | 8,900 | 10,600 |
Capitalized Computer Software, Additions | [1] | $ (3,210) | $ (1,837) | (1,117) |
Number of states in which the Company is licensed to market and sell health insurance | state |  | 50 |  |  |
Number of operating segments | segment |  | 2 | 2 |  |
Prior period reclassification adjustment |  |  | $ 800 | 600 |
Amortization of internally developed software | [1] | $ 1,464 | 936 | 627 |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent |  | 25.00% |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay |  | 1.00% |  |  |
Defined Contribution Plan, Matching Contributions Vesting Period |  | 3 years |  |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount |  | $ 400 | 300 | 300 |
Book-of-Business, Margin Earned |  | $ 900 | $ 1,000 | $ 1,200 |
[1] | As adjusted for the adoption of ASC 606 using the full retrospective method

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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