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Organization and Summary of Significant Accounting Policies - Revenue, Defined Contr. Plans, Advertising, Self-Insurance (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Finance and Insurance Sales |  |  |
Aggregate reserves relating to chargeback activity | $ 23.5 | $ 23.8 |
Defined Contribution Plans |  |  |
Expense incurred relating to defined contribution plans | 14.5 | 16.0 | $ 17.7
Advertising |  |  |
Net advertising costs | 102.5 | 101.0 | 93.7
Reimbursement of advertising expense | 16.6 | 17.2 | $ 14.3
Self Insurance |  |  |
Aggregate reserves relating to retained risk | $ 28.3 | $ 26.4 |

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