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Segment Information - Summarized Financial Information Reportable Segments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |
Total revenues | $ 3,051,398 | $ 2,613,375 | $ 2,392,171
Investment income | 1,099 | 2,811 | 5,780
Amortization | 119,593 | 108,523 | 105,298
Depreciation | 33,309 | 26,276 | 23,417
Interest expense | 64,981 | 58,973 | 63,660
Income before income taxes | 762,823 | 624,099 | 525,929
Total assets | 9,795,443 | 8,966,492 | 7,622,821
Capital expenditures | 45,045 | 70,700 | 73,108
Operating Segments | Retail |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 1,767,938 | 1,472,766 | 1,367,261
Investment income | 278 | 163 | 149
Amortization | 77,810 | 67,315 | 63,146
Depreciation | 11,194 | 9,071 | 7,390
Interest expense | 91,425 | 85,968 | 87,295
Income before income taxes | 334,377 | 262,245 | 222,875
Total assets | 5,040,706 | 7,093,627 | 6,413,459
Capital expenditures | 8,093 | 13,175 | 12,497
Operating Segments | National Programs |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 701,850 | 610,640 | 518,384
Investment income | 550 | 756 | 1,397
Amortization | 27,357 | 27,166 | 25,482
Depreciation | 9,839 | 8,658 | 6,791
Interest expense | 11,381 | 20,597 | 16,690
Income before income taxes | 242,334 | 182,892 | 143,737
Total assets | 2,943,006 | 3,510,983 | 3,110,368
Capital expenditures | 13,467 | 7,208 | 10,365
Operating Segments | Wholesale Brokerage |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 403,417 | 352,797 | 310,087
Investment income | 155 | 184 | 178
Amortization | 9,150 | 8,481 | 11,191
Depreciation | 2,646 | 1,948 | 1,674
Interest expense | 15,990 | 10,281 | 4,756
Income before income taxes | 94,845 | 93,593 | 82,739
Total assets | 1,154,373 | 1,791,717 | 1,390,250
Capital expenditures | 1,612 | 3,324 | 6,171
Operating Segments | Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 178,860 | 174,012 | 193,781
Investment income | 3 | 0 | 139
Amortization | 5,276 | 5,561 | 5,479
Depreciation | 1,484 | 1,424 | 1,229
Interest expense | 2,899 | 4,142 | 4,404
Income before income taxes | 28,257 | 27,994 | 40,337
Total assets | 299,185 | 480,440 | 481,336
Capital expenditures | 1,609 | 1,424 | 804
Segment Reconciling Items |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | (667) | 3,160 | 2,658
Investment income | 113 | 1,708 | 3,917
Amortization | 0 |  |
Depreciation | 8,146 | 5,175 | 6,333
Interest expense | (56,714) | (62,015) | (49,485)
Income before income taxes | 63,010 | 57,375 | 36,241
Total assets | 358,173 | (3,910,275) | (3,772,592)
Capital expenditures | $ 20,264 | $ 45,569 | $ 43,271

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