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Revenue Commission Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disaggregation of Revenue [Line Items] |  |  |
Advisory Revenue, Percent of Underlying Assets | 1.00% |  |
Commission Revenues | $ 4,505,072 | $ 3,305,487 | $ 2,552,623
Annuities [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Commission Revenues | 2,679,752 | 1,949,343 | 1,482,690
Mutual Funds [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Commission Revenues | 986,441 | 799,952 | 666,942
Fixed Income [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Commission Revenues | 256,520 | 216,872 | 154,177
Equities [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Commission Revenues | 202,984 | 152,500 | 110,698
Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Commission Revenues | 379,375 | 186,820 | 138,116
Transferred at Point in Time [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Commission Revenues | 2,645,913 | 1,763,232 | 1,252,783
Transferred at Point in Time [Member] | Annuities [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Commission Revenues | 1,633,309 | 1,069,811 | 739,760
Transferred at Point in Time [Member] | Mutual Funds [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Commission Revenues | 220,251 | 181,695 | 145,642
Transferred at Point in Time [Member] | Fixed Income [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Commission Revenues | 256,520 | 216,872 | 154,177
Transferred at Point in Time [Member] | Equities [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Commission Revenues | 202,984 | 152,500 | 110,698
Transferred at Point in Time [Member] | Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Commission Revenues | 332,849 | 142,354 | 102,506
Transferred over Time [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Commission Revenues | 1,859,159 | 1,542,255 | 1,299,840
Transferred over Time [Member] | Annuities [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Commission Revenues | 1,046,443 | 879,532 | 742,930
Transferred over Time [Member] | Mutual Funds [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Commission Revenues | 766,190 | 618,257 | 521,300
Transferred over Time [Member] | Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Commission Revenues | $ 46,526 | $ 44,466 | $ 35,610

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