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Revenues (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |
Document Period End Date |  |  | Jun. 30, 2018 |  |
Insurance Commissions | $ 333,583,000 |  | $ 671,578,000 |  |
Investment Income, Nonoperating | 731,000 | $ 351,000 | 1,332,000 | $ 594,000 |
Other Income | 388,000 | 1,230,000 | 910,000 | 21,501,000 |
Fees and Commissions, Other | 113,388,000 |  | 237,251,000 |  |
Incentive Commission | 8,623,000 |  | 32,439,000 |  |
Profit-Sharing Contingent Commission Revenue | 13,981,000 |  | 25,665,000 |  |
Guaranteed Supplemental Commission | 2,493,000 |  | 5,473,000 |  |
Revenues | 473,187,000 | 466,305,000 | 974,648,000 | 931,385,000 |
Contract with Customer, Asset and Liability [Table Text Block] | 213,477,000 |  | 213,477,000 |  | $ 210,323,000
Contract with Customer, Liability | 50,500,000 |  | 50,500,000 |  | 44,500,000
Contract with Customer, Liability, Noncurrent | 8,900,000 |  | 8,900,000 |  | 6,700,000
Contract with Customer, Liability | 59,361,000 |  | 59,361,000 |  | $ 51,236,000
Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Insurance Commissions | (155,000) |  | (29,000) |  |
Investment Income, Nonoperating | 482,000 |  | 895,000 |  |
Other Income | (49,000) |  | 9,000 |  |
Fees and Commissions, Other | (286,000) |  | (522,000) |  |
Incentive Commission | 3,000 |  | 12,000 |  |
Profit-Sharing Contingent Commission Revenue | 0 |  | 0 |  |
Guaranteed Supplemental Commission | 0 |  | 0 |  |
Segment Reconciling Items [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment Income, Nonoperating | 482,000 | 197,000 | 895,000 | 284,000 |
Revenues | (5,000) | 90,000 | 365,000 | 20,127,000 |
Retail [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Insurance Commissions | 193,242,000 |  | 401,548,000 |  |
Investment Income, Nonoperating | 0 | 1,000 | 1,000 | 3,000 |
Other Income | 346,000 |  | 551,000 |  |
Fees and Commissions, Other | 22,689,000 |  | 60,367,000 |  |
Incentive Commission | 8,389,000 |  | 31,949,000 |  |
Profit-Sharing Contingent Commission Revenue | 6,469,000 |  | 12,599,000 |  |
Guaranteed Supplemental Commission | 2,182,000 |  | 4,704,000 |  |
Revenues | 233,317,000 | 238,969,000 | 511,719,000 | 478,256,000 |
National Programs [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Insurance Commissions | 80,281,000 |  | 157,383,000 |  |
Investment Income, Nonoperating | 132,000 | 81,000 | 246,000 | 155,000 |
Other Income | 19,000 |  | 48,000 |  |
Fees and Commissions, Other | 32,479,000 |  | 63,672,000 |  |
Incentive Commission | (31,000) |  | 9,000 |  |
Profit-Sharing Contingent Commission Revenue | 5,521,000 |  | 9,503,000 |  |
Guaranteed Supplemental Commission | 39,000 |  | 54,000 |  |
Revenues | 118,440,000 | 113,675,000 | 230,915,000 | 214,858,000 |
Wholesale Brokerage [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Insurance Commissions | 60,215,000 |  | 112,676,000 |  |
Investment Income, Nonoperating | 81,000 | 0 | 81,000 | 0 |
Other Income | 72,000 |  | 302,000 |  |
Fees and Commissions, Other | 12,675,000 |  | 23,910,000 |  |
Incentive Commission | 262,000 |  | 469,000 |  |
Profit-Sharing Contingent Commission Revenue | 1,991,000 |  | 3,563,000 |  |
Guaranteed Supplemental Commission | 272,000 |  | 715,000 |  |
Revenues | 75,568,000 | 71,991,000 | 141,716,000 | 137,238,000 |
Services [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Insurance Commissions | 0 |  | 0 |  |
Investment Income, Nonoperating | 36,000 | 72,000 | 109,000 | 152,000 |
Other Income | 0 |  | 0 |  |
Fees and Commissions, Other | 45,831,000 |  | 89,824,000 |  |
Incentive Commission | 0 |  | 0 |  |
Profit-Sharing Contingent Commission Revenue | 0 |  | 0 |  |
Guaranteed Supplemental Commission | 0 |  | 0 |  |
Revenues | $ 45,867,000 | $ 41,580,000 | $ 89,933,000 | $ 80,906,000 |

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