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Organization and Summary of Significant Accounting Policies (Details 3) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Finance and Insurance Sales |  |  |
Aggregate reserves relating to chargeback activity | $ 23.8 | $ 25.8 |
Defined Contribution Plans |  |  |
Expense incurred relating to defined contribution plans | 16.0 | 17.7 | $ 15.1
Advertising |  |  |
Net advertising costs | 101.0 | 93.7 | 81.1
Reimbursement of advertising expense | 17.2 | 14.3 | $ 13.1
Self Insurance |  |  |
Aggregate reserves relating to retained risk | $ 26.4 | $ 24.6 |
Earnings Per Share |  |  |
Weighted average number of common shares outstanding | 89,759,626 | 90,318,839 | 90,273,747
Effect of non-participatory equity compensation (in shares) |  | 36,000 | 56,874
Weighted average number of common shares outstanding, including effect of dilutive securities | 89,759,626 | 90,354,839 | 90,330,621

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