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Basis of Financial Reporting Text Block (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Jan. 01, 2018 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  | $ 12,107,000
Insurance Commissions | $ 333,583,000 | $ 671,578,000 |  |  |
Profit-Sharing Contingent Commission Revenue | (13,981,000) | (25,665,000) |  |  |
Fees and Commissions, Other | 113,388,000 | 237,251,000 |  |  |
Operating Leases, Future Minimum Payments Due | 191,800,000 | 191,800,000 |  |  | 210,400,000
Share-based Compensation |  | 15,027,000 | $ 15,326,000 |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Insurance Commissions |  | 14,800,000 |  |  |
Profit-Sharing Contingent Commission Revenue |  | 17,000,000.0 |  |  |
Fees and Commissions, Other |  | (2,400,000) |  |  |
Retained Earnings [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  | $ 117,500,000 | $ 117,515,000
Cost to Obtain [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Deferred Costs | $ 6,600,000 | 6,600,000 |  |  |
Capitalized Contract Cost, Amortization |  | 100,000 |  |  |
Cost to Fulfill [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Deferred Costs |  |  |  | $ 52,700,000 |
Capitalized Contract Cost, Amortization |  | $ 3,900,000 |  |  |

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