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Revenues - Schedule of Disaggregated by Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Disaggregation Of Revenue [Line Items] |  |
Investment Income, Nonoperating | $ 1,161 | $ 1,081
Other income | 831 | 736
Revenues | 698,495 | 619,280
Corporate, Non-Segment |  |
Disaggregation Of Revenue [Line Items] |  |
Investment Income, Nonoperating | 765 | 677
Other income | 0 | 0
Revenues | 444 | 488
Retail | Operating Segments |  |
Disaggregation Of Revenue [Line Items] |  |
Investment Income, Nonoperating | 83 | 0
Other income | 706 | 592
Revenues | 447,489 | 389,231
National Programs | Operating Segments |  |
Disaggregation Of Revenue [Line Items] |  |
Investment Income, Nonoperating | 263 | 316
Other income | 13 | 37
Revenues | 128,412 | 109,560
Wholesale Brokerage | Operating Segments |  |
Disaggregation Of Revenue [Line Items] |  |
Investment Income, Nonoperating | 50 | 40
Other income | 112 | 107
Revenues | 77,698 | 70,509
Services | Operating Segments |  |
Disaggregation Of Revenue [Line Items] |  |
Investment Income, Nonoperating | 0 | 48
Other income | 0 | 0
Revenues | 44,452 | 49,492
Core Commission Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 460,033 | 418,539
Core Commission Revenue | Corporate, Non-Segment |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other |  | (12)
Core Commission Revenue | Retail |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 315,888 | 287,200
Core Commission Revenue | National Programs |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 88,582 | 77,178
Core Commission Revenue | Wholesale Brokerage |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 55,563 | 54,173
Core Commission Revenue | Services |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 0 | 0
Fee Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 151,913 | 135,789
Fee Revenue | Corporate, Non-Segment |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | (322) | (288)
Fee Revenue | Retail |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 57,483 | 43,877
Fee Revenue | National Programs |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 34,659 | 30,246
Fee Revenue | Wholesale Brokerage |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 15,641 | 12,510
Fee Revenue | Services |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 44,452 | 49,444
Incentive Commissions Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 56,759 | 44,178
Incentive Commissions Revenue | Corporate, Non-Segment |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 1 | 111
Incentive Commissions Revenue | Retail |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 52,802 | 42,775
Incentive Commissions Revenue | National Programs |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 197 | 919
Incentive Commissions Revenue | Wholesale Brokerage |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 3,759 | 373
Incentive Commissions Revenue | Services |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 0 | 0
Profit-Sharing Contingent Commission Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 23,942 | 15,322
Profit-Sharing Contingent Commission Revenue | Corporate, Non-Segment |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 0 | 0
Profit-Sharing Contingent Commission Revenue | Retail |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 16,095 | 11,547
Profit-Sharing Contingent Commission Revenue | National Programs |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 5,711 | 860
Profit-Sharing Contingent Commission Revenue | Wholesale Brokerage |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 2,136 | 2,915
Profit-Sharing Contingent Commission Revenue | Services |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 0 | 0
Guaranteed Supplemental Commission Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 3,856 | 3,635
Guaranteed Supplemental Commission Revenue | Corporate, Non-Segment |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 0 | 0
Guaranteed Supplemental Commission Revenue | Retail |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 4,432 | 3,240
Guaranteed Supplemental Commission Revenue | National Programs |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | (1,013) | 4
Guaranteed Supplemental Commission Revenue | Wholesale Brokerage |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 437 | 391
Guaranteed Supplemental Commission Revenue | Services |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | $ 0 | $ 0

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