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Revenues (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |
Document Period End Date |  |  | Jun. 30, 2019 |  |
Investment Income, Nonoperating | $ 1,525,000 | $ 731,000 | $ 2,606,000 | $ 1,332,000 |
Other Income | 762,000 | 388,000 | 1,498,000 | 910,000 |
Revenues | 575,219,000 | 473,187,000 | 1,194,499,000 | $ 974,648,000 |
Contract with Customer, Asset and Liability [Table Text Block] | 285,099,000 |  | 285,099,000 |  | $ 265,994,000
Contract with Customer, Liability | 41,700,000 |  | 41,700,000 |  | 37,000,000.0
Contract with Customer, Liability, Noncurrent | 17,000,000 |  | 17,000,000 |  | 16,500,000
Contract with Customer, Liability | 58,726,000 |  | 58,726,000 |  | 53,496,000
Deferred Revenue, Revenue Recognized | 12,800,000 |  |  |  |
Deferred Costs | 19,700,000 |  | 19,700,000 |  | 13,200,000
Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment Income, Nonoperating | 1,051,000 |  | 1,728,000 |  |
Other Income | 0 |  | 0 |  |
Segment Reconciling Items [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment Income, Nonoperating | 1,051,000 | 482,000 |  |  |
Revenues | 696,000 | (5,000) | 1,184,000 |  |
Retail [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment Income, Nonoperating | 17,000 | 0 | 17,000 |  |
Other Income | 544,000 |  | 1,136,000 |  |
Revenues | 310,738,000 | 233,317,000 | 699,969,000 |  |
National Programs [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment Income, Nonoperating | 380,000 | 132,000 | 696,000 |  |
Other Income | 13,000 |  | 50,000 |  |
Revenues | 131,817,000 | 118,440,000 | 241,377,000 |  |
Wholesale Brokerage [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment Income, Nonoperating | 43,000 | 81,000 | 83,000 |  |
Other Income | 205,000 |  | 312,000 |  |
Revenues | 81,171,000 | 75,568,000 | 151,680,000 |  |
Services [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment Income, Nonoperating | 34,000 | 36,000 | 82,000 |  |
Other Income | 0 |  | 0 |  |
Revenues | 50,797,000 | $ 45,867,000 | 100,289,000 |  |
Core Commission Revenue [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Fees and Commissions, Other | 369,592,000 |  | 788,131,000 |  |
Core Commission Revenue [Member] | Retail [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Fees and Commissions, Other | 219,421,000 |  | 506,621,000 |  |
Core Commission Revenue [Member] | National Programs [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Fees and Commissions, Other | 85,093,000 |  | 162,271,000 |  |
Core Commission Revenue [Member] | Wholesale Brokerage [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Fees and Commissions, Other | 65,052,000 |  | 119,225,000 |  |
Core Commission Revenue [Member] | Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Fees and Commissions, Other | 0 |  | 0 |  |
Core Commission Revenue [Member] | Other Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Fees and Commissions, Other | 26,000 |  | 14,000 |  |
Fee Revenue [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Fees and Commissions, Other | 167,715,000 |  | 303,504,000 |  |
Fee Revenue [Member] | Retail [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Fees and Commissions, Other | 68,827,000 |  | 112,704,000 |  |
Fee Revenue [Member] | National Programs [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Fees and Commissions, Other | 34,472,000 |  | 64,718,000 |  |
Fee Revenue [Member] | Wholesale Brokerage [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Fees and Commissions, Other | 13,940,000 |  | 26,450,000 |  |
Fee Revenue [Member] | Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Fees and Commissions, Other | 50,763,000 |  | 100,207,000 |  |
Fee Revenue [Member] | Other Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Fees and Commissions, Other | (287,000) |  | (575,000) |  |
Incentive Commission Revenue [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Fees and Commissions, Other | 10,899,000 |  | 55,077,000 |  |
Incentive Commission Revenue [Member] | Retail [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Fees and Commissions, Other | 12,714,000 |  | 55,489,000 |  |
Incentive Commission Revenue [Member] | National Programs [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Fees and Commissions, Other | (1,846,000) |  | (927,000) |  |
Incentive Commission Revenue [Member] | Wholesale Brokerage [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Fees and Commissions, Other | 125,000 |  | 498,000 |  |
Incentive Commission Revenue [Member] | Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Fees and Commissions, Other | 0 |  | 0 |  |
Incentive Commission Revenue [Member] | Other Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Fees and Commissions, Other | (94,000) |  | 17,000 |  |
Profit-Sharing Contingent Commission Revenue [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Fees and Commissions, Other | 11,983,000 |  | 27,305,000 |  |
Profit-Sharing Contingent Commission Revenue [Member] | Retail [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Fees and Commissions, Other | 6,659,000 |  | 18,206,000 |  |
Profit-Sharing Contingent Commission Revenue [Member] | National Programs [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Fees and Commissions, Other | 4,093,000 |  | 4,953,000 |  |
Profit-Sharing Contingent Commission Revenue [Member] | Wholesale Brokerage [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Fees and Commissions, Other | 1,231,000 |  | 4,146,000 |  |
Profit-Sharing Contingent Commission Revenue [Member] | Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Fees and Commissions, Other | 0 |  | 0 |  |
Profit-Sharing Contingent Commission Revenue [Member] | Other Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Fees and Commissions, Other | 0 |  | 0 |  |
Guaranteed Supplemental Commission Revenue [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Fees and Commissions, Other | 12,743,000 |  | 16,378,000 |  |
Guaranteed Supplemental Commission Revenue [Member] | Retail [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Fees and Commissions, Other | 2,556,000 |  | 5,796,000 |  |
Guaranteed Supplemental Commission Revenue [Member] | National Programs [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Fees and Commissions, Other | 9,612,000 |  | 9,616,000 |  |
Guaranteed Supplemental Commission Revenue [Member] | Wholesale Brokerage [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Fees and Commissions, Other | 575,000 |  | 966,000 |  |
Guaranteed Supplemental Commission Revenue [Member] | Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Fees and Commissions, Other | 0 |  | 0 |  |
Guaranteed Supplemental Commission Revenue [Member] | Other Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Fees and Commissions, Other | 0 |  | 0 |  |
Cost to Obtain [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Deferred Costs | 7,100,000 |  | 7,100,000 |  |
Capitalized Contract Cost, Amortization |  |  | 600,000 |  |
Cost to Fulfill [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Deferred Costs | $ 69,000,000.0 |  | 69,000,000.0 |  | $ 69,800,000
Capitalized Contract Cost, Amortization |  |  | $ 800,000 |  |

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